Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-ncis!helios.ee.lbl.gov!pasteur!ucbvax!hplabs!hpda!hpcupt1!andrews
From: andrews@hpcupt1.HP.COM (Edward E. Andrews)
Newsgroups: comp.sys.ibm.pc
Subject: Writing a debugger question
Message-ID: <5930023@hpcupt1.HP.COM>
Date: 6 Jan 89 17:14:23 GMT
Organization: Hewlett Packard, Cupertino
Lines: 13


	While writing a debugger I've run across the DOS function 4B with
subfunction 1.  This is supposed to load a program without executing it.
I've found that the initial CS:IP and SS:SP are returned.  Also, the
termination address in the PSP of the just loaded program point back
to the instruction just after the INT 21h.

	My questions are: do all debuggers use this?  is this the best way
to load a program for debugging?  are there any "gotchas" by loading a
program this way?  how is the program "unloaded" when the debugger itself
terminates (i.e. the program doesn't do DOS fucnction 4c)?

	Thanks in advance.