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From: ekalenda@cup.portal.com (Edward John Kalenda)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Communicating With Resident Programs
Message-ID: <34438@cup.portal.com>
Date: 2 Oct 90 01:53:09 GMT
References: <679@digigw.digital.co.jp>
Organization: The Portal System (TM)
Lines: 12

Gordon W. Day writes:
> Could somebody suggest the best way to communicate with a driver?  I have 
> successfully implemented a block device driver, but I am at a loss as to the
> best way to communicate with it from a transient program.  I have come up 
> with three ideas, both with advantages and disadvantages:

The best way is to use the generic ioctl function. INT 21h, function 44h,
sub-function 0Dh allows your application to send and receive driver
specific messages.  Page 466 of the MS-DOS Encyclodedia talks about it.

Ed
ekalenda@cup.portal.com