Message-ID: <8713@microsoft.UUCP>
Date: Tue, 28-Aug-84 17:12:17 EDT
Article-I.D.: microsof.8713
Posted: Tue Aug 28 17:12:17 1984
Date-Received: Fri, 31-Aug-84 05:46:12 EDT
Organization: Microsoft Corporation
Lines: 27

I've seen several articles recently on the location and use of the
"INDOS" flag to allow system calls from within interrupt service routines.

Naturally, you own your machines and your software and can do whatever
you please, but those writting software for distribution and/or support
should be aware of (what I hope is) the obvious:

	1) this is not supported under any version of the DOS

	2) it usually works under DOS 2, but there may be circumstances
	   when it doesn't (general disclaimer, don't know of a specific
	   circumstance)

	3) it will usually not work under DOS 3 and DOS 3.1; the DOS is
	   considerably restructured and this flag takes on additional
	   meanings and uses

	4) it will fail catestrophically under DOS 4.0 and forward.


  This is just a specific example of the generic principle for all
software products:  "if it isn't documented then it isn't supported and
will probably go away or change in future releases."


	Gordon Letwin
	Microsoft