[[hopefully someone will write an introduction to tk, explaining its virtues]]

   * What is Tk
[Tk] is a [Tcl] [extension] designed to make creating [GUI] interfaces simple, 
yet giving said applications remarkable power for all their simplicity.


   * What makes it unique

The Tk [canvas] is one of the more powerful [widget]s developers have
found. The Tk [text] widget has built in hypertext and undo/redo capability. 
Tk was designed for rapid development.

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'''Hints for beginners'''
(things that may not be obvious if you come to Tk from the wrong community):

''The window concept''
   1. Every rectangular unit (in particular: the various widgets) on the screen is called a '''window'''. Windows as in "document window" is a [toplevel].
   1. Windows (toplevels excepted) do not show on screen until they have become mapped. This happen when they are assigned a geometry manager, such as [pack] or [grid].
   1. Every window has a unique name, which is also the name of a command. This command -- the "widget command" -- is used to control the window: change contents, set options, change view, etc.
   1. Windows are created and destroyed in a hierarchy. This hierarchy is visible in the window names: removing the last period (.) and all that follows it from a window name gets you the name of the parent window. (Exception: the root window is called "." (one period) rather than "" (empty string) as this rule would imply.) All window names start with a period.

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Some example programs:
   * [Simple Canvas Demo]
   * [Simple Entry Demo]

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[Category Documentation]