'''X''' usually refers to the '''X Window System''',
currently at Version 11  Revision 6. Hence often also
refered to as '''X11''', or '''X11R6'''.

This X11 is not to be confused with [MacOS X] which is also often just called "X" by Mac afficiandos.

[Xlib] is the interface to the X11 protocol.  Tk emulates many Xlib functions on platforms that don't have X11.  In this way Tk has a virtual machine.

References

   * http://www.x.org        - X in general
   * http://www.xfree86.org  - XFree implementation of X (servers)
   * news://comp.windows.x

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[Category Application]