Date: Mon, 22 Dec 1997 10:18:41 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: Ashod <ashod AT ozemail DOT com DOT au>
cc: djgpp AT delorie DOT com
Subject: Re: DJGPP TSR'S DLL'S
In-Reply-To: <01bd06b6$94dbf6e0$63206ccb@ashod>
Message-ID: <Pine.SUN.3.91.971222101809.10387J-100000@is>
MIME-Version: 1.0
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On 22 Dec 1997, Ashod wrote:

> does djgpp support protected mode tsr and/or dlls, also if i run a djgpp
> in windows and then start another  djgpp in another window ( i.e  not
> one app spawning another), can the two talk.

First, protected-mode TSRs can only be supported if you have a
DPMI 1.0 server.  Since Windows only implements DPMI 0.9, you can't
have this under Windows.

Second, two DOS boxes can only talk to each other through some global
TSR (i.e., one that is loaded *before* Windows, and is therefore
mapped into each DOS box address space).  TSRs that are loaded *after*
Windows loads are local to the DOS box where they are loaded, and so
have no easy means of talking to each other through memory.

One way of such communications is by using the Windows clipboard.  I'm
told that this can be quite slow, but if your application doesn't need
speedy communications, it will probably do.