It transpires that the behaviour of [[wm geometry ...]] is quite different between the standard Tk platforms.  This page is to document those differences (since the wm man page doesn't do so).

The main differences are between whether this command manipulates/queries the entire window including borders/titlebar or just the contents, and in what aspects can be set/queried during a window's creation or while it is withdrawn.

'''Difference 1: wm geometry . +0+0'''

''Windows'' and ''MacOS X'' -- 'wm geometry . +0+0' will move the main toplevel so that it nestles into the top-left corner of the screen, with the left border and titlebar completely visible.

''X11'' -- 'wm geometry . +0+0' will move the main toplevel so that its contents are nestled into the top-left corner of the screen, but with the left border and titlebar completely ''offscreen and invisible''.

In summary ''positioning with wm geometry controls the window contents on X11, but the window structure on Windows/MacOS X''.

'''Difference 2: ...'''


...to be filled in...


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