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From: stm@apple.com (Steve Maller)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: PICT compression; Screen refresh
Message-ID: <10361@goofy.Apple.COM>
Date: 21 Sep 90 20:04:21 GMT
References: <1990Sep19.163943.18602@agate.berkeley.edu>
Sender: usenet@Apple.COM
Organization: Apple Computer
Lines: 13

In article <1990Sep19.163943.18602@agate.berkeley.edu> 
bri@garnet.berkeley.edu (Brian Reilly) writes:
> ...on what basis/when does HyperCard refresh the screen?

Unfortunately the answer to that question is currently "any time it damn 
well pleases". There is currently no reliable way of predicting when a 
screen refresh will occur. The recommended way of handling picture display 
thingies is to write an XCMD/external window which places pictures in a 
window(s) that float above the card window.

Steve Maller
HyperCard Engineering Team
Apple Computer