20) CALL

    The DOS 5.0 manual, in the command reference for CALL, states:

    Syntax: call [drive:][path]filename [batch-parameters]

            Parameters [drive:][path]filename

            Specifies the name and location of the batch program you
            want to call.  Filename must have a .BAT extension.

            The latter sentence is not true in DOS 5.0.  CALL works
            equally well whether "filename" is a .BAT, .COM, or .EXE
            file, or even internal command the following all work
            just fine:

            call dir
            call mem
            call tree
            call echo Phhhhhhht!

                              Gary Smith

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21) CHOICE

    I blundered onto an interesting choice.com feature:

        CHOICE /C:XM*; /N /T:2,5
        if errorlevel=4 goto help
        if errorlevel=3 goto end
        ......etc

        The "*" is the escape key, and the ";" is F1 etc.

                              Robert Lindsay

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22) MEM /A

    If you do a MEM /A it'll give you details of what's in the first meg
    of memory.

    Windoze owners get MSD.EXE (a pretty undocumented utility), that tells
    you this sort of thing.  If you do a MEM /A it'll give you details of
    what's in the first meg of memory.

                              Ben Davis

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23) MOUSE /U

    Microsoft mouse driver version 8.1 has a /U switch.  Adding that switch
    loads all but 3.3k of the driver into HMA.  It's not quite the most
    recent version mouse driver, but hey, a mouse driver is a mouse driver
    is a mouse driver, right?  Especially when it only takes 3.3k of ram!

                              Mark Carter

    Are you getting that result by loading the mouse driver high on a 286?
    If so, that is good news. Mine takes up 12k of main RAM (MS mouse
    driver ver. 7.0).

                              Gerry Pareja

    Mouse 8.0 _is_ able to load itself into HMA (I think) on a 286 by using
    the undocumented /U switch. I read it in PC Magazine sometime back.
    Also, PC Mag said that the BUFFERS have to be set to a low value, e.g. 5.

                               Ng Cheng Kiang

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