Date: Sat, 07 Dec 2002 22:06:01 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: djgpp-workers AT delorie DOT com
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In-reply-to: <3DF092CA.BF0114F1@phekda.freeserve.co.uk> (message from Richard
	Dawe on Fri, 06 Dec 2002 12:06:34 +0000)
Subject: Re: RESEND: Re: File UItils at Clio 2.04 Query
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> Date: Fri, 06 Dec 2002 12:06:34 +0000
> From: Richard Dawe <rich AT phekda DOT freeserve DOT co DOT uk>
> 
> I don't know why the driver for my CD-ROM drive hooks INT 21h.

It does so because MSCDEX, the Microsoft's driver, supported IOCTL
functions.  IOCTL is implemented as subfunctions of Int 21h, function
44h.