redhat man page for lower

lower(n)						       Tk Built-In Commands							  lower(n)

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NAME
       lower - Change a window's position in the stacking order

SYNOPSIS
       lower window ?belowThis?
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DESCRIPTION
       If  the belowThis argument is omitted then the command lowers window so that it is below all of its siblings in the stacking order (it will
       be obscured by any siblings that overlap it and will not obscure any siblings).	If belowThis is specified then it must be the path name of
       a  window  that	is either a sibling of window or the descendant of a sibling of window.  In this case the lower command will insert window
       into the stacking order just below belowThis (or the ancestor of belowThis that is a sibling of window); this could end up  either  raising
       or lowering window.

SEE ALSO
       raise

KEYWORDS
       lower, obscure, stacking order

Tk									3.3								  lower(n)