Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!ukma!psuvm.bitnet!cunyvm!unknown
From: rrk@byuvax.bitnet
Newsgroups: comp.os.vms
Subject: Re: Remote terminal through DECnet from application
Message-ID: <120rrk@byuvax.bitnet>
Date: 8 May 88 18:21:19 GMT
Lines: 39

I've been posting requests for some time for this information, with no response
whatsoever.  I know of no place it is documented.  Here is the only way
I have been able to find out about it:

The following procedure makes /NOTRACEBACK images into debugable images.
If you save this procedure to DEBUG.COM and enter the command:

$ @DEBUG SYS$SYSTEM:RTPAD

it will place a debugable copy of RTPAD.EXE (the image run by $ SET HOST)
in your directory.  Then make the logical definition:

$ DEFINE RTPAD SYS$DISK:[]RTPAD

and then issue your set host command.  This will run the RTPAD in your current
directory instead of the one in SYS$SYSTEM.  You should get a debugger prompt.
You can step through and into the routines as much as you want to see about
what happens when you do a $ SET HOST.  You don't have any debugger symbols,
but you can figure out what calls are being made if you are a little familiar
with assembler code and know a few things.  You will encounter various types
of calls:

CALLS #N,@#7FFnnnnn

Is a call to a system service.  To find out what system service is being
called,

$!---------------------------cut here-----debug.com---------
$ patch/abs 'p1'
e/word 2
e \+4
dep .+4 = \
e .-8
dep .+4 = \
dep .-4 = 7ffedf68
e 20
dep . = \ or 1
update
$!----------------------cut here---end of debug.com----------------------