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From: seaburg@uiuccsb.UUCP
Newsgroups: net.micro.pc
Subject: Re: Non-reentrant DOS interrupts - (nf)
Message-ID: <4007@uiucdcs.UUCP>
Date: Sun, 20-Nov-83 22:27:48 EST
Article-I.D.: uiucdcs.4007
Posted: Sun Nov 20 22:27:48 1983
Date-Received: Wed, 23-Nov-83 02:44:58 EST
Lines: 13

#R:ihlpf:17100019:uiuccsb:5100004:000:471
uiuccsb!seaburg    Nov 20 14:48:00 1983

You can do file I/O from a DOS character I/O routine (BIOS) and the other
way around, but character I/O can't invoke more character I/O (same for
disk) because it screws up the stack.  The reason you can switch is that
there are 2 stacks involved.

The only suggestion I can give if you want to nest the same kind of calls
is to trace through in DEBUG and try to figure out where the stacks 
are.  (Or bribe someone at MicroSoft into giving you advice!)

uiucdcs!seaburg