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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DJGPP TSR
Date: Thu, 24 Jan 2002 11:39:54 CST
Organization: Rice University, Houston TX
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> Calling function 31H directly is what's done in the program DJGPPTSR.C.

Yes.  It works with CWSDPMI and some other DPMI providers (but not all).
I don't remember the details (too many years ago).