[TclX] provides a kill command only for Unix(-like) systems.










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"kill" is rather foreign to Windows programming.  From a programming
standpoint, one generally sends a {WM_CLOSE,WM_QUIT,...} to a Win32
application (Tcl programmers can "send" such messages with
[winutil]::sendmessage).

Windows workers also should be aware of 
   * the sample /samples/sdktools/winnt/tlist/kill.c included with the Win32 SDK (still there in recent versions?)
   * the "WinTop" or "Windows Process Watcher" (it's had different names at different times) utility [Microsoft] makes available as part of its "Kernel Toys" [http://www.microsoft.com/windows/windows95/info/kerneltoys.htm]