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Date: Thu, 1 Nov 2007 20:46:59 -0400
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From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <1193963270.088377.101010@22g2000hsm.googlegroups.com> (message
	from RayeR on Thu, 01 Nov 2007 17:27:50 -0700)
Subject: Re: PM interrupt handling - how to call old old ISR with slower rate than my new ISR
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You need to use the non-chained hook, and call the old one via one of
the other DPMI functions... "call real mode procedure with IRET frame"

For best performance, also hook the real-mode timer interrupt, else
there'll be lots of mode switching.