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From: Invader@cup.portal.com (Michael K Donegan)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Seeing if a window in onscreen
Message-ID: <36091@cup.portal.com>
Date: 20 Nov 90 07:12:50 GMT
References: <1990Nov19.193405.20185@Neon.Stanford.EDU>
Organization: The Portal System (TM)
Lines: 5

See IM-V p. 121-122.
If you just want to know if it is visible, you can test it against GrayRgn.
If you want to know which screen, you will have to run through the device
list and check against each gdRect.
	mkd