3)  SHELL=C:\COMMAND.COM /E:1024 /F /P

    The /F in your Config.sys SHELL= statement is another undocumented
    feature.

    It forces a "Fail" response to the "Abort, Retry, Fail" prompt issued
    by the DOS critical error handler.

                              Dennis McCunney

    The /F switch on the SHELL command in CONFIG.SYS will not work in
    a DESQview environment. The only thing I have found that will is a
    program called FATAL.COM.

                              Bruce Bowman

    COMMAND /F

    Makes all those annoying "Abort, Retry, Ignore, Fail?"
    disk error messages default to "Fail".

                              Erik Ratcliffe

    For DOS 3.30 (somebody might care to check these for other versions):

    COMMAND /P

       Docs say that this doesn't allow you to exit back to the
       previous shell (ie /Permanent), but /P also forces
       \autoexec.bat to be run on secondary shells.

    COMMAND /D

       (When used with a primary shell, or secondary with /P)
       prevents execution of \autoexec.bat

                              Mitch Ames

    I just checked, and these also both apply to DOS 5.00

                              Mitch Ames

===============================================================================
4)  VER/R

    Yields extended information about the OS Version.  IE:

    MS-DOS Version 5.00
    Revision A
    DOS is in HMA

                              Billy Gilbreath

    Doesn't work with DOS 3.30

                              Mitch Ames

===============================================================================
5)  ECHO OFF     from the command line erases the prompt and leaves
                 just a cursor on the screen.

    ECHO ON      from the command line restores the prompt.
 
    This works with all version of DOS (tested so far!).

                              Michael Larsson

    One of the most frequently asked questions in the BatPower echo
    is "How do I ECHO a blank line?"  The most common answer is "ECHO."
    However, I have captured a few posts which expand on the
    possible answers to this request:

                              Editor's Note

    ECHO"

                              Paul Welsh

    just about any white space character will work. 

                              Alan Newbery

    I just found out myself that any delimiter will work here
    (ECHO. ECHO" ECHO, ECHO: ECHO; ECHO[ ECHO] etc.).  Apparently
    it's just the way that the command handles the delimiter and
    has been available from way back.  Microsoft just began
    mentioning it in the documentation recently, though, and their
    examples use a period.

                              John Whitfield

===============================================================================