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From: c8902348@wombat.newcastle.edu.au
Newsgroups: comp.os.msdos.apps,comp.os.msdos.misc
Subject: Re: using share in dos4dir
Message-ID: <1991May15.113950.1@wombat.newcastle.edu.au>
Date: 15 May 91 01:39:50 GMT
References: <3603@casbah.acns.nwu.edu> <1991May13.215237.4309@d.cs.okstate.edu>
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In article <1991May13.215237.4309@d.cs.okstate.edu>, mmccorm@d.cs.okstate.edu (McCormick Martin) writes:
> 
> From: halpern@casbah.acns.nwu.edu (David Halpern)
> I've recently installed dos4.0 on my pc and everytime I boot I guet this
> warning message telling me to install share for large media.  I should also
> add that I have a 286pc with  20MB and 40MB hard drives.  Why am I getting
> this message and what should I do to stop getting it ?
> ------------------------------------------------------------------------
>       Please post to the group.  Obviously, we could install SHARE, but
> I'd really rather know the reason for this message.  Without digging 
> through the DOS manual, I recall that SHARE.EXE has to do with opening 
> and sharing data files between applications.
> 
> Martin McCormick
> Amateur Radio WB5AGZ
> Oklahoma State University
> Stillwater, OK

Its basically this.. Because DOS 4 introduced a new File Descriptor format
some programs that do naughty things, like bypassing Bios/DOS could
relly stuff up your hard disk.. So share is there for large drives
to fix thios problem. Also share is used for MultiTasking/LAN operations
(MultiUSER), to regulate who can have the file open at the same time..

Ie.. If you were to have two applications writing to the same file at the
same time, you can imagine the problems that would cause, so basically
it would let the first application to open the file to have exclusive access
to it.. And make the other application wait till the first is finished..

Well this is a simple view of it.. Its much more involved than this..

Tony