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From: jdb@reef.cis.ufl.edu (Brian K. W. Hook)
Newsgroups: comp.os.msdos.programmer
Subject: Installing PASSWORD protection in config.sys (summary)
Keywords: device, password, config.sys
Message-ID: <28395@uflorida.cis.ufl.EDU>
Date: 3 May 91 20:18:00 GMT
References: <1991May3.000656.1462@ccu.umanitoba.ca>
Sender: news@uflorida.cis.ufl.EDU
Organization: UF CIS Dept.
Lines: 30

About a week ago I posted a question asking:

"How do I install a password protection program that I wrote in C in my
config.sys file so that Ctrl-Break won't work." (Ctrl-Break works in
AUTOEXEC.baT).

General replies were:

1.  On DOS 4.0x you can use the line:

	INSTALL=C:\PASS.EXE
	
    I have not tried this, since I don't have DOS 4.0x...

2.  Use the SHELL= statement.  If you do this, it remains memory resident
and you must spawn() command.com to get the real interpreter working.
Exec() will NOT work.

3.  Write an ASM device driver.  I don't know ASM well enough.

4.  Write a C device driver.  This requires knowing technical stuff about
how to write a device driver, none of which I know.

5.  Put "BREAK=OFF" in config.sys and stick the password program in 
AUTOEXEC.BAT...haven't tried yet.

6.  Buy "BOOTCON.SYS".  I did just that and it works beautifully :-).
Multiple autoexecs and config.sys files, etc.

Brian