Iconification/de-iconification is a co-operative process between a client and
a window manager.  The relevant standards are set by ICCCM.  Mwm is ICCCM
compliant.  The toplevel (non-override-redirect) windows of an application may
be in three states: WithdrawnState (neither the window nor icon visible),
NormalState (the window visible) or IconicState (the icon window or pixmap
visible).  This information is contained in the WM_STATE property but ordinary
clients are not supposed to look at that (its values have not yet been
standardised).  Movement between the three states is standardised by ICCCM.
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