Purpose: Document (particularly core distribution) Tcl and Tk differences
between supported platforms.

   * Features unique to X Windows versions of Tk
   1. -display support

   * Features unique to Microsoft Windows versions of Tk
   1. [[What are the Windows specific extensions - like registry, etc.]]

   * Features unique to Apple MacOS X versions of Tk
   1. [[What are the MacOS X specific extensions]]

   * Features which work differently 
   1. Native widgets on Windows/MacOS X vs Unix Tcl and C widgets [[is there a wiki page detailing which of these exist]]
   2. menu unpost is documented to not work on windows
   3. [[wm attributes]] takes different values on Windows/MacOS, and does nothing on Unix (in Tcl/Tk 8.4.9.0, at least).
   4. Icon support in [wm].
   5. Mouse wheel bindings.
   6. "Right" mouse button bindings - Mac users expect "context" menus to work with Ctrl-Mouse-1, and Button-3 is assigned differently, if a three-button mouse is connected.


----
[Category Porting]