Advice on windowshape command

[RGould8 at aol.com]

Is there an URL someone can point me to that gives step-by-step instructions 
on how to create a mask that can be used with the windowshape command?   I've 
created a black-and-white mask, saved it as an 8-bit PNG, like the 
documentation describes, then I do a "set the windowshape of this stack to 1003" (the 
object ID # of that imported bitmap image), and the window flickers, but does not 
change.   I'm not sure what I'm doing wrong.   Any advice is greatly 
appreciated.

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