diff --git a/beh.go b/beh.go
index c40c8f0..4bf9306 100644
--- a/beh.go
+++ b/beh.go
@@ -4,13 +4,12 @@ package tg
 type Behaviour struct {
 	Root Component
 	Init Action
-	Screens ScreenMap
+	//Screens ScreenMap
 }
 
 // Returns new empty behaviour.
 func NewBehaviour() *Behaviour {
 	return &Behaviour{
-		Screens: make(ScreenMap),
 	}
 }
 
@@ -21,6 +20,11 @@ func (b *Behaviour) SetInit(a Action) *Behaviour {
 	return b
 }
 
+/*func (b *Behaviour) SetScreens(screens ScreenMap) *Behaviour {
+	b.Screens = screens
+	return b
+}
+
 // Sets the root node of the Behaviour.
 // Mostly used for commands and such stuff.
 func (b *Behaviour) SetRootNode(node *RootNode) *Behaviour {
@@ -28,6 +32,7 @@ func (b *Behaviour) SetRootNode(node *RootNode) *Behaviour {
 	return b
 }
 
+*/
 // The function sets as the standard root widget CommandWidget
 // and its commands..
 func (b *Behaviour) SetRootWidget(root Component) *Behaviour {
@@ -35,6 +40,7 @@ func (b *Behaviour) SetRootWidget(root Component) *Behaviour {
 	return b
 }
 
+/*
 // Check whether the screen exists in the behaviour.
 func (beh *Behaviour) PathExist(pth Path) bool {
 	_, ok := beh.Screens[pth]
@@ -43,7 +49,6 @@ func (beh *Behaviour) PathExist(pth Path) bool {
 
 // Returns the screen by it's ID.
 func (beh *Behaviour) GetScreen(pth Path) *Screen {
-	pth = pth.Clean()
 	if !beh.PathExist(pth) {
 		panic(ScreenNotExistErr)
 	}
@@ -51,4 +56,4 @@ func (beh *Behaviour) GetScreen(pth Path) *Screen {
 	screen := beh.Screens[pth]
 	return screen
 }
-
+*/
diff --git a/bot.go b/bot.go
index d5cce6d..f0fb99d 100644
--- a/bot.go
+++ b/bot.go
@@ -43,7 +43,7 @@ func (bot *Bot) SetDebug(debug bool) *Bot {
 	return bot
 }
 
-func (bot *Bot) Api() *tgbotapi.BotAPI {
+func (bot *Bot) API() *tgbotapi.BotAPI {
 	return bot.api
 }
 
@@ -53,16 +53,16 @@ func (bot *Bot) Me() User {
 
 // Send the Renderable to the specified session client side.
 // Can be used for both group and private sessions because
-// SessionId represents both for chat IDs.
+// SessionID represents both for chat IDs.
 func (bot *Bot) Send(
-	sid SessionId, v Sendable,
+	sid SessionID, v Sendable,
 ) (*Message, error) {
 	config := v.SendConfig(sid, bot)
 	if config.Error != nil {
 		return nil, config.Error
 	}
 
-	msg, err := bot.api.Send(config.ToApi())
+	msg, err := bot.api.Send(config.ToAPI())
 	if err != nil {
 		return nil, err
 	}
@@ -71,7 +71,7 @@ func (bot *Bot) Send(
 }
 
 func (bot *Bot) Sendf(
-	sid SessionId, format string, v ...any,
+	sid SessionID, format string, v ...any,
 ) (*Message, error){
 	return bot.Send(
 		sid,
@@ -81,7 +81,7 @@ func (bot *Bot) Sendf(
 
 // Send to the session specified its ID raw chattable from the tgbotapi.
 func (bot *Bot) SendRaw(
-	sid SessionId, v tgbotapi.Chattable,
+	sid SessionID, v tgbotapi.Chattable,
 ) (*Message, error) {
 	msg, err := bot.api.Send(v)
 	if err != nil {
@@ -93,7 +93,7 @@ func (bot *Bot) SendRaw(
 // Get session by its ID. Can be used for any scope
 // including private, group and channel.
 func (bot *Bot) GotSession(
-	sid SessionId,
+	sid SessionID,
 ) (*Session, bool) {
 	session, ok := bot.sessions[sid]
 	return session, ok
@@ -158,7 +158,7 @@ func (bot *Bot) SetCommands(
 
 	botCmds := []tgbotapi.BotCommand{}
 	for _, cmd := range cmds {
-		botCmds = append(botCmds, cmd.ToApi())
+		botCmds = append(botCmds, cmd.ToAPI())
 	}
 
 	//tgbotapi.NewBotCommandScopeAllPrivateChats(),
@@ -210,7 +210,7 @@ func (bot *Bot) Run() error {
 		go bot.handleGroup(chn)
 	}*/
 
-	me, _ := bot.Api().GetMe()
+	me, _ := bot.API().GetMe()
 	bot.me = me
 	for up := range updates {
 		u := Update{
@@ -238,11 +238,10 @@ func (bot *Bot) Run() error {
 // The function handles updates supposed for the private
 // chat with the bot.
 func (bot *Bot) handlePrivate(updates chan Update) {
-	var sid SessionId
+	var sid SessionID
 	for u := range updates {
-		sid = SessionId(u.FromChat().ID)
+		sid = SessionID(u.FromChat().ID)
 		session, sessionOk := bot.sessions[sid]
-
 		if u.Message != nil && !sessionOk {
 			// Creating session if we have none
 			// but only on text messages.
diff --git a/build.sh b/btest
similarity index 100%
rename from build.sh
rename to btest
diff --git a/button.go b/button.go
index d921ccd..7c5b0ba 100644
--- a/button.go
+++ b/button.go
@@ -78,14 +78,14 @@ func (btn Button) WithSendLocation(ok bool) Button {
 	return btn
 }
 
-func (btn Button) Go(pth Path) Button {
-	return btn.WithAction(ScreenGo{
+func (btn Button) Go(pth Widget) Button {
+	return btn.WithAction(WidgetGo{
 		Path: pth,
 	})
 }
 
-func (btn Button) GoWithArg(pth Path, arg any) Button {
-	return btn.WithAction(ScreenGo{
+func (btn Button) GoWithArg(pth Widget, arg any) Button {
+	return btn.WithAction(WidgetGo{
 		Path: pth,
 		Arg: arg,
 	})
diff --git a/cmd/test/cmd.go b/cmd/test/cmd.go
index f2f606a..7ee8dad 100644
--- a/cmd/test/cmd.go
+++ b/cmd/test/cmd.go
@@ -20,7 +20,7 @@ var BotCommands = []tg.Command{
 	tg.NewCommand(
 		"start",
 		"start or restart the bot or move to the start screen",
-	).Go(StartAbsPath),
+	).Go(StartWidget),
 	tg.NewCommand(
 		"info",
 		"info desc",
diff --git a/cmd/test/incdec.go b/cmd/test/incdec.go
index a8c4fa5..a3cdc62 100644
--- a/cmd/test/incdec.go
+++ b/cmd/test/incdec.go
@@ -5,10 +5,9 @@ import (
 	"fmt"
 )
 
-const (
-	IncDecPath tg.Path = "inc-dec"
-)
-
+// A simple example widget to show
+// how to store and get session data values
+// and working with dynamic panels.
 var IncDecWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	var (
 		kbd *tg.InlineCompo
diff --git a/cmd/test/keyboard.go b/cmd/test/keyboard.go
index fa5f60e..b84de79 100644
--- a/cmd/test/keyboard.go
+++ b/cmd/test/keyboard.go
@@ -4,8 +4,8 @@ import (
 	"surdeus.su/core/tg"
 )
 
-var HomeButton = tg.Buttonf("Home").Go("/")
-var BackButton = tg.Buttonf("Back").Go("-")
+var HomeButton = tg.Buttonf("Home").Go(StartWidget)
+var BackButton = tg.Buttonf("Back").Go(tg.Back)
 var BackKeyboard = tg.NewKeyboard().Row(
 	BackButton,
 )
diff --git a/cmd/test/location.go b/cmd/test/location.go
index a03eeea..86ef727 100644
--- a/cmd/test/location.go
+++ b/cmd/test/location.go
@@ -4,10 +4,6 @@ import (
 	"surdeus.su/core/tg"
 )
 
-const (
-	LocationPath tg.Path = "location"
-)
-
 var LocationWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
diff --git a/cmd/test/main.go b/cmd/test/main.go
index e5b7c37..5cf81e4 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -22,67 +22,36 @@ func ExtractSessionData(c tg.Context) *SessionData {
 var beh = tg.NewBehaviour().SetInit(tg.Func(func(c tg.Context) {
 	// The session initialization.
 	c.SetSessionData(&SessionData{})
-})).SetRootNode(tg.NewRootNode(
-	// The "/" widget.
-	StartWidget,
-
-	tg.NewNode(
-		PanelPath,
-		PanelWidget,
+})).SetRootWidget(
+	// Setting as the most top
+	// widget command handling
+	// so we can call them at any screen.
+	tg.NewCommandCompo().SetUsage(
+		UsageAction,
+	).SetPreStart(
+		PreStartAction,
+	).SetCommands(
+		BotCommands...,
 	),
-
-	tg.NewNode(
-		MutateMessagesPath,
-		MutateMessagesWidget,
-
-		tg.NewNode(
-			UpperCasePath,
-			MutateMessagesToUpperCaseWidget,
-		),
-		tg.NewNode(
-			LowerCasePath,
-			MutateMessagesToLowerCaseWidget,
-		),
-		tg.NewNode(
-			EscapePath,
-			MutateMessagesEscapeWidget,
-		),
-	),
-
-	tg.NewNode(
-		IncDecPath,
-		IncDecWidget,
-	),
-
-	tg.NewNode(
-		LocationPath,
-		LocationWidget,
-	),
-)).SetRootWidget(tg.NewCommandCompo().SetUsage(
-	UsageAction,
-).SetPreStart(
-	PreStartAction,
-).SetCommands(
-	BotCommands...,
-))
+)
 
 func main() {
 	token := os.Getenv("BOT_TOKEN")
 
 	bot, err := tg.NewBot(token)
 	if err != nil {
-		log.Panic(err)
+		log.Fatalf("tg.NewBot(...): %s", err)
 	}
 	bot = bot.SetBehaviour(beh)
-	//SetDebug(true)
+	//bot.API().Debug = true
 
 	bot.SetData(&BotData{
 		Name: "Jay",
 	})
 
-	log.Printf("Authorized on account %s", bot.Api().Self.UserName)
+	log.Printf("Authorized on account %s", bot.API().Self.UserName)
 	err = bot.Run()
 	if err != nil {
-		panic(err)
+		log.Fatalf("bot.Run(...): %s", err)
 	}
 }
diff --git a/cmd/test/mutate.go b/cmd/test/mutate.go
index 84c6eb1..3094bee 100644
--- a/cmd/test/mutate.go
+++ b/cmd/test/mutate.go
@@ -43,22 +43,15 @@ func (w *MutateMessageCompo) Filter(u tg.Update) bool {
 	return false
 }
 
-const (
-	UpperCasePath      tg.Path = "upper-case"
-	LowerCasePath              = "lower-case"
-	EscapePath                 = "escape"
-	MutateMessagesPath         = "mutate-messages"
-)
-
-var MutateMessagesWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
+var MutateMessagesWidget= tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
 			"Choose widget to mutate strings",
 		).Reply(
 			tg.NewKeyboard().Row(
-				tg.Buttonf("Upper case").Go(UpperCasePath),
-				tg.Buttonf("Lower case").Go(LowerCasePath),
-				tg.Buttonf("Escape chars").Go(EscapePath),
+				tg.Buttonf("Upper case").Go(UpperCaseWidget),
+				tg.Buttonf("Lower case").Go(LowerCaseWidget),
+				tg.Buttonf("Escape chars").Go(EscapeWidget),
 			).Row(
 				BackButton,
 			).Reply(),
@@ -66,7 +59,7 @@ var MutateMessagesWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	}
 })
 
-var MutateMessagesToLowerCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
+var LowerCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
 			"Type a string and the bot will convert it to lower case",
@@ -77,7 +70,7 @@ var MutateMessagesToLowerCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	}
 })
 
-var MutateMessagesToUpperCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
+var UpperCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
 			"Type a string and the bot will convert it to upper case",
@@ -87,7 +80,7 @@ var MutateMessagesToUpperCaseWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 		NewMutateMessageCompo(strings.ToUpper),
 	}
 })
-var MutateMessagesEscapeWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
+var EscapeWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
 			"Type a string and the bot will escape characters in it",
diff --git a/cmd/test/panel.go b/cmd/test/panel.go
index 0156431..fd77ff7 100644
--- a/cmd/test/panel.go
+++ b/cmd/test/panel.go
@@ -4,11 +4,7 @@ import (
 	"surdeus.su/core/tg"
 )
 
-const (
-	PanelPath tg.Path = "panel"
-)
-
-var PanelWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
+var DynamicPanelWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	var (
 		n     = 0
 		ln    = 4
diff --git a/cmd/test/start.go b/cmd/test/start.go
index 0dc5389..6403f5b 100644
--- a/cmd/test/start.go
+++ b/cmd/test/start.go
@@ -5,36 +5,30 @@ import (
 	"fmt"
 )
 
-const (
-	StartAbsPath tg.Path = "/"
-)
-
 var StartWidget = tg.RenderFunc(func(c tg.Context) tg.UI {
 	return tg.UI{
 		tg.Messagef(
 			fmt.Sprint(
-				"Hello, %s!\n",
-				"The testing bot started!\n",
+				"Hello, %s!",
+				"The testing bot started!",
 				"You can see the basics of usage in the ",
-				"cmd/test/main.go file!",
+				"cmd/test/main.go file and other files in the cmd/test!",
 			),
 			c.CallbackUpdate().SentFrom().UserName,
 		).Inline(
 			tg.NewKeyboard().Row(
-				tg.Buttonf("TeleGopher Vultras page").
-					WithUrl("https://vultras.su/core/tg"),
+				tg.Buttonf("TeleGopher surdeus.su page").
+					WithUrl("https://surdeus.su/core/tg"),
 			).Inline(),
 		),
 
 		tg.Messagef("Choose your interest").Reply(
-			tg.NewKeyboard().Row(
-				tg.Buttonf("Inc/Dec").Go(IncDecPath),
-			).Row(
-				tg.Buttonf("Mutate messages").Go(MutateMessagesPath),
-			).Row(
-				tg.Buttonf("Send location").Go(LocationPath),
-			).Row(
-				tg.Buttonf("Dynamic panel").Go(PanelPath),
+			tg.NewKeyboard().List(
+				tg.Buttonf("Inc/Dec").Go(IncDecWidget),
+				tg.Buttonf("Mutate messages").Go(MutateMessagesWidget),
+				tg.Buttonf("Send location").Go(LocationWidget),
+				tg.Buttonf("Dynamic panel").Go(DynamicPanelWidget),
+				tg.Buttonf("Check panic").Go(nil),
 			).Reply(),
 		),
 
diff --git a/command.go b/command.go
index e1adbe4..9f3b5a9 100644
--- a/command.go
+++ b/command.go
@@ -4,6 +4,7 @@ import (
 	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
 
+
 type CommandType uint8
 const (
 	PrivateCommandType CommandType = iota
@@ -44,7 +45,7 @@ func (c Command) WithWidget(w Widget) Command {
 }
 
 // Convert command into the tgbotapi.BotCommand
-func (c Command) ToApi() tgbotapi.BotCommand {
+func (c Command) ToAPI() tgbotapi.BotCommand {
 	ret := tgbotapi.BotCommand{}
 	ret.Command = string(c.Name)
 	ret.Description = c.Description
@@ -52,14 +53,14 @@ func (c Command) ToApi() tgbotapi.BotCommand {
 }
 
 // Simple command to go to another screen.
-func (c Command) Go(pth Path) Command {
-	return c.WithAction(ScreenGo{
+func (c Command) Go(pth Widget) Command {
+	return c.WithAction(WidgetGo{
 		Path: pth,
 	})
 }
 
-func (c Command) GoWithArg(pth Path, arg any) Command {
-	return c.WithAction(ScreenGo{
+func (c Command) GoWithArg(pth Widget, arg any) Command {
+	return c.WithAction(WidgetGo{
 		Path: pth,
 		Arg: arg,
 	})
@@ -125,7 +126,7 @@ func (compo *CommandCompo) Serve(c Context) {
 	// First should bring the new command into the action.
 	c.Bot().DeleteCommands()
 	err := c.Bot().SetCommands(
-		tgbotapi.NewBotCommandScopeChat(c.SessionId().ToApi()),
+		tgbotapi.NewBotCommandScopeChat(c.SessionID().ToAPI()),
 		compo.Commands,
 	)
 
@@ -135,11 +136,12 @@ func (compo *CommandCompo) Serve(c Context) {
 
 	var cmdUpdates *UpdateChan
 	for u := range c.Input() {
-		if c.Path() == "" && u.Message != nil {
+		if c.Path() == nil && u.Message != nil {
 			// Skipping and executing the preinit action
 			// while we have the empty screen.
 			// E. g. the session did not start.
-			if !(u.Message.IsCommand() && u.Message.Command() == "start") {
+			if !u.Message.IsCommand() ||
+					u.Message.Command() != "start" {
 				c.WithUpdate(u).Run(compo.PreStart)
 				continue
 			}
diff --git a/context.go b/context.go
index 0e35b4c..23a392f 100644
--- a/context.go
+++ b/context.go
@@ -30,7 +30,7 @@ type Context struct {
 // maybe you will find another usage for this.
 // Returns users context by specified session ID
 // or false if the user is not logged in.
-func (c Context) As(sid SessionId) (Context, bool) {
+func (c Context) As(sid SessionID) (Context, bool) {
 	s, ok := c.Bot().GotSession(sid)
 	if !ok {
 		return Context{}, false
@@ -58,6 +58,9 @@ func (f Func) Render(_ Context) UI {
 	}
 }
 
+// The type represents type
+// of current context the processing is happening
+// in.
 type ContextType uint8
 const (
 	NoContextType ContextType = iota
@@ -69,7 +72,14 @@ const (
 func (c Context) serve() {
 	beh := c.Bot().behaviour
 	c.Run(beh.Init)
-	beh.Root.Serve(c)
+	for {
+		defer func(){
+			if err := recover() ; err != nil {
+				// Need to add some handling later.
+			}
+		}()
+		beh.Root.Serve(c)
+	}
 }
 
 func (c Context) Arg() any {
@@ -85,12 +95,12 @@ func (c Context) Run(a Action) {
 
 // Sends to the Sendable object to the session user.
 func (c Context) Send(v Sendable) (*Message, error) {
-	config := v.SendConfig(c.SessionId(), c.Bot())
+	config := v.SendConfig(c.SessionID(), c.Bot())
 	if config.Error != nil {
 		return nil, config.Error
 	}
 
-	msg, err := c.Bot().Api().Send(config.ToApi())
+	msg, err := c.Bot().API().Send(config.ToAPI())
 	if err != nil {
 		return nil, err
 	}
@@ -172,14 +182,16 @@ func (c Context) CallbackUpdate() *Update {
 }
 
 // Returns the reader for specified file ID and path.
-func (c Context) GetFile(fileId FileId) (io.ReadCloser, string, error) {
-	file, err := c.Bot().Api().GetFile(tgbotapi.FileConfig{FileID:string(fileId)})
+func (c Context) GetFile(fileID FileID) (io.ReadCloser, string, error) {
+	file, err := c.Bot().API().GetFile(tgbotapi.FileConfig{
+		FileID: string(fileID),
+	})
 	if err != nil {
 		return nil, "", err
 	}
 	r, err := http.Get(fmt.Sprintf(
 		"https://api.telegram.org/file/bot%s/%s",
-		c.Bot().Api().Token,
+		c.Bot().API().Token,
 		file.FilePath,
 	))
 	if err != nil {
@@ -193,8 +205,8 @@ func (c Context) GetFile(fileId FileId) (io.ReadCloser, string, error) {
 }
 
 // Reads all the content from the specified file.
-func (c Context) ReadFile(fileId FileId) ([]byte, string, error)  {
-	file, pth, err := c.GetFile(fileId)
+func (c Context) ReadFile(fileID FileID) ([]byte, string, error)  {
+	file, pth, err := c.GetFile(fileID)
 	if err != nil {
 		return nil, "", err
 	}
@@ -240,10 +252,9 @@ func (c Context) runWidget(widget Widget, arg any) (*UpdateChan, error) {
 		return nil, EmptyWidgetErr
 	}
 
-	pth := c.Path()
 	compos := widget.Render(c.WithArg(arg))
 	// Leave if changed path or components are empty.
-	if compos == nil || pth != c.Path() {
+	if compos == nil {
 		return nil, EmptyCompoErr
 	}
 	chns := make([]*UpdateChan, len(compos))
@@ -289,52 +300,41 @@ func (c Context) runWidget(widget Widget, arg any) (*UpdateChan, error) {
 }
 
 // Simple go without an argument for context.
-func (c Context) Go(pth Path) error {
+func (c Context) Go(pth Widget) error {
 	return c.GoWithArg(pth, nil)
 }
 
-// Changes screen of user to the Id one.
-// Also gives the arg to the widget calling
-// contexts.
-func (c Context) GoWithArg(pth Path, arg any) error {
+// Go to the specified widget with the
+// specificed argument.
+func (c Context) GoWithArg(pth Widget, arg any) error {
 	var err error
-	if pth == "" {
-		c.session.pathHistory = []Path{}
+	if pth == nil {
+		c.session.pathHistory = []Widget{}
 		return nil
 	}
+
 	var back bool
-	if pth == "-" {
+	if pth == Back {
 		if len(c.session.pathHistory) < 2 {
-			return c.GoWithArg("", arg)
+			return c.GoWithArg(nil, arg)
 		}
 		pth = c.session.pathHistory[len(c.session.pathHistory)-2]
-		c.session.pathHistory = c.session.pathHistory[:len(c.session.pathHistory)-1]
-	}
-	// Getting the screen and changing to
-	// then executing its widget.
-	if !pth.IsAbs() {
-		pth = (c.Path() + "/" + pth).Clean()
+		c.session.pathHistory =
+			c.session.pathHistory[:len(c.session.pathHistory)-1]
+		back = true
 	}
 
-	if !c.PathExist(pth) {
-		return ScreenNotExistErr
-	}
-
-	if !back && c.Path() != pth {
+	if !back {
 		c.session.pathHistory = append(c.session.pathHistory, pth)
 	}
 
 	// Stopping the current widget.
-	screen := c.Bot().behaviour.Screens[pth]
 	c.session.skippedUpdates.Close()
 
-	if screen.Widget != nil {
-		c.session.skippedUpdates, err = c.runWidget(screen.Widget, arg)
-		if err != nil {
-			return err
-		}
-	} else {
-		return NoWidgetForScreenErr
+	// Running the new one.
+	c.session.skippedUpdates, err = c.runWidget(pth, arg)
+	if err != nil {
+		return err
 	}
 
 	return nil
@@ -352,8 +352,8 @@ func (c Context) SessionData() any {
 	return c.session.Data
 }
 
-func (c Context) SessionId() SessionId {
-	return c.session.Id
+func (c Context) SessionID() SessionID {
+	return c.session.ID
 }
 
 func (c Context) SessionScope() SessionScope {
@@ -372,20 +372,15 @@ func (c Context) Bot() *Bot {
 	return c.session.bot
 }
 
-// Returns true if the path exists and false otherwise.
-func (c Context) PathExist(pth Path) bool {
-	return c.session.bot.behaviour.PathExist(pth)
-}
-
 // Return context's session's path history.
-func (c Context) PathHistory() []Path {
+func (c Context) PathHistory() []Widget {
 	return c.session.pathHistory
 }
 
-func (c Context) Path() Path {
+func (c Context) Path() Widget {
 	ln := len(c.session.pathHistory)
 	if ln == 0 {
-		return ""
+		return nil
 	}
 	return c.session.pathHistory[ln-1]
 }
diff --git a/devel-loop b/devel-loop
new file mode 100755
index 0000000..3a4848a
--- /dev/null
+++ b/devel-loop
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+wgo sh -c './btest && ./exe/test'
+
diff --git a/file.go b/file.go
index c198398..cebd3ce 100644
--- a/file.go
+++ b/file.go
@@ -10,6 +10,7 @@ import (
 	"github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
 
+type FileID string
 type FileConfig = tgbotapi.FileConfig
 type PhotoConfig = tgbotapi.PhotoConfig
 type FileType int
@@ -107,10 +108,10 @@ func (f *File) SendData() string {
 }
 
 func (f *File) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (SendConfig) {
 	var config SendConfig
-	cid := sid.ToApi()
+	cid := sid.ToAPI()
 
 	switch f.Type() {
 	case PhotoFileType:
@@ -119,7 +120,7 @@ func (f *File) SendConfig(
 
 		config.Chattable = photo
 	case DocumentFileType:
-		doc := tgbotapi.NewDocument(sid.ToApi(), f)
+		doc := tgbotapi.NewDocument(sid.ToAPI(), f)
 		doc.Caption = f.caption
 		config.Chattable = doc
 	default:
diff --git a/go.go b/go.go
index 985c290..d38b96d 100644
--- a/go.go
+++ b/go.go
@@ -1,22 +1,33 @@
 package tg
 
-func Go(pth Path) UI {
+func Go(pth Widget) UI {
 	return UI{
-		GoWidget(pth),
+		WidgetGo{
+			Path: pth,
+		},
 	}
 }
 
-type GoWidget string
-// Implementing the Server interface.
-func (widget GoWidget) Serve(c Context) {
-	c.input.Close()
-	c.Go(Path(widget))
+// The type implements changing current path to the widget.
+type WidgetGo struct {
+	Path Widget
+	Arg any
 }
 
-func (widget GoWidget) Render(c Context) UI {
+func (sc WidgetGo) Act(c Context) {
+	c.GoWithArg(sc.Path, sc.Arg)
+}
+
+// Implementing the Server interface.
+func (widget WidgetGo) Serve(c Context) {
+	c.input.Close()
+	c.Go(widget)
+}
+
+func (widget WidgetGo) Render(c Context) UI {
 	return UI{widget}
 }
 
-func (widget GoWidget) Filter(u Update) bool {
+func (widget WidgetGo) Filter(u Update) bool {
 	return true
 }
diff --git a/inline.go b/inline.go
index 5c11352..128c971 100644
--- a/inline.go
+++ b/inline.go
@@ -11,7 +11,7 @@ type Inline struct {
 }
 
 // Convert the inline keyboard to markup for the tgbotapi.
-func (kbd Inline) ToApi() tgbotapi.InlineKeyboardMarkup {
+func (kbd Inline) ToAPI() tgbotapi.InlineKeyboardMarkup {
 	rows := [][]tgbotapi.InlineKeyboardButton{}
 	for _, row := range kbd.Rows {
 		if row == nil {
@@ -38,12 +38,12 @@ type InlineCompo struct {
 
 // Implementing the Sendable interface.
 func (compo *InlineCompo) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (SendConfig) {
 	sendConfig := compo.MessageCompo.SendConfig(sid, bot)
 	msg := sendConfig.Chattable.(tgbotapi.MessageConfig)
 	if len(compo.Inline.Rows) > 0 {
-		msg.ReplyMarkup = compo.Inline.ToApi()
+		msg.ReplyMarkup = compo.Inline.ToAPI()
 	}
 	sendConfig.Chattable = msg
 
@@ -56,23 +56,23 @@ func (compo *InlineCompo) SendConfig(
 func (compo *InlineCompo) Update(c Context) error {
 	if compo.Message != nil {
 		var edit tgbotapi.Chattable
-		markup := compo.Inline.ToApi()
+		markup := compo.Inline.ToAPI()
 		ln := len(markup.InlineKeyboard)
 		if ln == 0 || compo.Inline.Rows == nil {
 			edit = tgbotapi.NewEditMessageText(
-				c.SessionId().ToApi(),
+				c.SessionID().ToAPI(),
 				compo.Message.MessageID,
 				compo.Text,
 			)
 		} else {
 			edit = tgbotapi.NewEditMessageTextAndMarkup(
-				c.SessionId().ToApi(),
+				c.SessionID().ToAPI(),
 				compo.Message.MessageID,
 				compo.Text,
 				markup,
 			)
 		}
-		msg, err := c.Bot().Api().Send(edit)
+		msg, err := c.Bot().API().Send(edit)
 		if err != nil {
 			return err
 		}
@@ -113,7 +113,7 @@ func (compo *InlineCompo) OnOneUpdate(c Context, u Update) error {
 	)
 	data := u.CallbackQuery.Data
 
-	_, err := c.Bot().Api().Request(cb)
+	_, err := c.Bot().API().Request(cb)
 	if err != nil {
 		return err
 	}
diff --git a/invoice.go b/invoice.go
index 87d8037..8e8e0d1 100644
--- a/invoice.go
+++ b/invoice.go
@@ -10,7 +10,7 @@ type InvoiceCompo struct {
 }
 
 func (compo *InvoiceCompo) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (*SendConfig) {
 	return nil
 }
diff --git a/location.go b/location.go
index 9bca927..6f94e18 100644
--- a/location.go
+++ b/location.go
@@ -12,9 +12,9 @@ type LocationCompo struct {
 }
 
 func (compo *LocationCompo) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (SendConfig) {
-	cid := sid.ToApi()
+	cid := sid.ToAPI()
 	location := tgbotapi.NewLocation(
 		cid,
 		compo.Latitude,
diff --git a/message.go b/message.go
index d98ccc6..e810081 100644
--- a/message.go
+++ b/message.go
@@ -34,11 +34,11 @@ func Escape2(str string) string {
 // Call the function after the message was sent.
 func (compo *MessageCompo) Update(c Context) error {
 	edit := tgbotapi.NewEditMessageText(
-		c.Session().Id.ToApi(),
+		c.Session().ID.ToAPI(),
 		compo.Message.MessageID,
 		compo.Text,
 	)
-	msg, err := c.Bot().Api().Send(edit)
+	msg, err := c.Bot().API().Send(edit)
 	if err != nil {
 		return err
 	}
@@ -49,8 +49,8 @@ func (compo *MessageCompo) Update(c Context) error {
 // Calling the method removes the message on the client side
 // and sets the Message in the component to nil.
 func (compo *MessageCompo) Delete(c Context) error {
-	cfg := tgbotapi.NewDeleteMessage(c.session.Id.ToApi(), compo.Message.MessageID)
-	_, err := c.Bot().Api().Send(cfg)
+	cfg := tgbotapi.NewDeleteMessage(c.session.ID.ToAPI(), compo.Message.MessageID)
+	_, err := c.Bot().API().Send(cfg)
 	if err != nil {
 		return err
 	}
@@ -121,7 +121,7 @@ func (msg *MessageCompo) Location(
 
 // Implementing the Sendable interface.
 func (compo *MessageCompo) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (SendConfig) {
 	var (
 		ret SendConfig
@@ -136,7 +136,7 @@ func (compo *MessageCompo) SendConfig(
 		text = compo.Text
 	}
 
-	msg := tgbotapi.NewMessage(sid.ToApi(), text)
+	msg := tgbotapi.NewMessage(sid.ToAPI(), text)
 	msg.ParseMode = compo.ParseMode
 	ret.Chattable = msg
 
diff --git a/reply.go b/reply.go
index 1b42ec1..316f256 100644
--- a/reply.go
+++ b/reply.go
@@ -64,7 +64,7 @@ type ReplyCompo struct {
 
 // Implementing the sendable interface.
 func (compo *ReplyCompo) SendConfig(
-	sid SessionId, bot *Bot,
+	sid SessionID, bot *Bot,
 ) (SendConfig) {
 	sendConfig := compo.MessageCompo.SendConfig(sid, bot)
 
diff --git a/screen.go b/screen.go
index 674180a..f8a9787 100644
--- a/screen.go
+++ b/screen.go
@@ -1,48 +1,32 @@
 package tg
 
-import (
-	"path"
+type WidgetSpecial int
+const (
+	widgetEmpty WidgetSpecial = iota
+	widgetBack
 )
 
-// The type implements changing screen to the underlying ScreenId
-type ScreenGo struct {
-	Path Path
-	Arg any
+
+func (w WidgetSpecial) Render(_ Context) UI {
+	return nil
 }
 
-func (sc ScreenGo) Act(c Context) {
-	c.GoWithArg(sc.Path, sc.Arg)
-}
+var (
+	Back = Widget(widgetBack)
+)
 
-// The same as Act.
-func (sc ScreenGo) Serve(c Context) {
-	sc.Act(c)
-}
-
-// Unique identifier for the screen
-// and relative paths to the screen.
-type Path string
+/*// Unique identifier for the screen.
+type Path int
+const (
+	PathEmpty Path = 0
+	// Going to the path returns
+	// a context to the previous screen.
+	PathBack Path = -1
+)
 
 // Returns true if the path is empty.
 func (p Path) IsEmpty() bool {
-	return p == ""
-}
-
-// Returns true if the path is absolute.
-func (p Path) IsAbs() bool {
-	if len(p) == 0 {
-		return false
-	}
-	return p[0] == '/'
-}
-
-func (p Path) Dir() Path {
-	return Path(path.Dir(string(p)))
-}
-
-// Clean the path deleting exceed ., .. and / .
-func (p Path) Clean() Path {
-	return Path(path.Clean(string(p)))
+	return p == 0
 }
 
 // Screen statement of the bot.
@@ -64,10 +48,10 @@ type Node struct {
 	Path Path
 	Screen *Screen
 	Subs []*Node
-}
+}*/
 
 // Return new root node with the specified widget in the screen.
-func NewRootNode(widget Widget, subs ...*Node) *RootNode {
+/*func NewRootNode(widget Widget, subs ...*Node) *RootNode {
 	ret := &RootNode{}
 	ret.Screen = NewScreen(widget)
 	ret.Subs = subs
@@ -114,15 +98,13 @@ func (n *Node) ScreenMap(root Path) ScreenMap {
 		}
 	}
 	return m
-}
+}*/
 
-// Map structure for the screens.
-type ScreenMap map[Path] *Screen
 
 // Returns the new screen with specified name and widget.
-func NewScreen(widget Widget) *Screen {
+/*func NewScreen(widget Widget) *Screen {
 	return &Screen{
 		Widget: widget,
 	}
-}
+}*/
 
diff --git a/send.go b/send.go
index 7403286..860f260 100644
--- a/send.go
+++ b/send.go
@@ -10,7 +10,7 @@ type MessageId int64
 // way to define what message will be
 // sent to the side of a user.
 type Sendable interface {
-	SendConfig(SessionId, *Bot) (SendConfig)
+	SendConfig(SessionID, *Bot) (SendConfig)
 	SetMessage(*Message)
 }
 
@@ -25,7 +25,7 @@ type SendConfig struct {
 type MessageMap map[string] *Message
 
 // Convert to the bot.Api.Send format.
-func (config SendConfig) ToApi() tgbotapi.Chattable {
+func (config SendConfig) ToAPI() tgbotapi.Chattable {
 	return config.Chattable
 }
 
diff --git a/session.go b/session.go
index e8476fe..96ada00 100644
--- a/session.go
+++ b/session.go
@@ -2,12 +2,12 @@ package tg
 
 // The type represents map of sessions using
 // as key.
-type SessionMap map[SessionId]*Session
+type SessionMap map[SessionID]*Session
 
 // Add new empty session by it's ID.
 func (sm SessionMap) Add(
 	bot *Bot,
-	sid SessionId,
+	sid SessionID,
 	scope SessionScope,
 ) *Session {
 	ret := NewSession(bot, sid, scope)
@@ -27,32 +27,32 @@ const (
 
 // Represents unique value to identify chats.
 // In fact is simply ID of the chat.
-type SessionId int64
+type SessionID int64
 
-// Convert the SessionId to Telegram API's type.
-func (si SessionId) ToApi() int64 {
+// Convert the SessionID to Telegram API's type.
+func (si SessionID) ToAPI() int64 {
 	return int64(si)
 }
 
 // The type represents current state of
 // user interaction per each of them.
 type Session struct {
-	// Id of the chat of the user.
-	Id SessionId
+	// ID of the chat of the user.
+	ID SessionID
 	Scope SessionScope
 	// Custom value for each user.
 	Data  any
 
 	bot *Bot
-	pathHistory []Path
+	pathHistory []Widget
 	skippedUpdates *UpdateChan
 	updates *UpdateChan
 }
 
 // Return new empty session.
-func NewSession(bot *Bot, id SessionId, scope SessionScope) *Session {
+func NewSession(bot *Bot, id SessionID, scope SessionScope) *Session {
 	ret := &Session{}
-	ret.Id = id
+	ret.ID = id
 	ret.Scope = scope
 	ret.bot = bot
 	ret.updates = NewUpdateChan()
diff --git a/update.go b/update.go
index cfd3122..a08809b 100644
--- a/update.go
+++ b/update.go
@@ -2,7 +2,6 @@ package tg
 
 import tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 
-type FileId string
 
 type Update struct {
 	tgbotapi.Update
@@ -64,8 +63,8 @@ func (u Update) HasDocument() bool {
 		u.Message.Document != nil
 }
 
-func (u Update) DocumentId() FileId {
-	return FileId(u.Update.Message.Document.FileID)
+func (u Update) DocumentID() FileID {
+	return FileID(u.Update.Message.Document.FileID)
 }
 
 func (u *Update) DocumentName() string {
@@ -85,10 +84,10 @@ func (u Update) HasPhotos() bool {
 		len(u.Message.Photo) != 0
 }
 
-func (u Update) PhotoIds() []FileId {
-	ret := make([]FileId, len(u.Message.Photo))
+func (u Update) PhotoIDs() []FileID {
+	ret := make([]FileID, len(u.Message.Photo))
 	for i, photo := range u.Message.Photo {
-		ret[i] = FileId(photo.FileID)
+		ret[i] = FileID(photo.FileID)
 	}
 	return ret
 }