setting the VIS

[Richmond]

You can make any object in RunRev invisible; with the
proviso that subordinate objects inherit their visibility
from their superordinate objects.

set the vis of OBJECT "WHATEVERITSCALLED" to false

and, obviously, return it to visibility:

set the vis of OBJECT "WHATEVERITSCALLED" to true

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Personally I prefer to call a stack a stack rather than a window;

only because a 'window' can refer to other parts of a GUI's "furniture"
so can prove confusing.