Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!aw0g+
From: aw0g+@andrew.cmu.edu (Aaron Wohl)
Newsgroups: comp.sys.mac.programmer
Subject: Re: VBL or patch traps?
Message-ID: <AZCRnhK00WA1E0eF4g@andrew.cmu.edu>
Date: 16 Oct 89 13:51:41 GMT
References: <189@uhura.cs.wisc.edu>
Distribution: usa
Organization: Computing Systems, Carnegie Mellon, Pittsburgh, PA
Lines: 6
In-Reply-To: <189@uhura.cs.wisc.edu>

If you want to put up a real dialog that you control you can't do that
from a vbl task.  If some text with an ok button is enough then you can
use the notification manager to do that (see the tech note).  If you
want the real dialog there are two things you can do a)Make a device
driver that loads into the system help and use it's idle routine. 
b)Patch a trap.  Aaron