[jaws-uk] Re: Explanation of terms if possible.
- From: "Tristram Llewellyn" <tris-l@xxxxxxxxxx>
- To: <jaws-uk@xxxxxxxxxxxxx>
- Date: Fri, 21 Jul 2006 16:08:31 +0100
All screen readers and magnififers need at some level to intercept information
from the video sub system of Windows, the way they do this can vary by
operating system and also their internal workings. The latter point is of
particular interest as each developer usually creates there own way of
accessing this sub system. In Windows 98 for technical reasons this was not a
big problem, but with Windows NT and beyond it is a major issue.
DCM or Display Chaining Manager is a Microsoft specification that most of the
major accessiblity developers signed up to a few years ago. GW Micro who
produce WindowEyes were commissioned to do part of the coding for this. The
inner workings are not really a suitable topic for this list, but in essence
what it provides is a why for different access technology products to share a
Windows operating system. Previously they would assume that each had sole
right to it and would therefore frequently be totally incompatible with
eachother. DCM basically lays down some rules that they all follow which allow
multiple accessibility products to co-exist on PCs.
As a result of Microsofts help in defining the DCM standard seems anecdontally
in my view to have had the side effect of helping developers build much more
robust and reliable video intecept technologies, and now of course they
co-exist far better although not always perfectly in some isolated cases.
Regards.
Tristram Llewellyn
Sight and Sound Technology
Technical Support
www.sightandsound.co.uk
----- Original Message -----
From: Dorothy Ingram-Gorban
To: jaws-uk@xxxxxxxxxxxxx
Sent: Friday, July 21, 2006 3:45 PM
Subject: [jaws-uk] Explanation of terms if possible.
sorry about this but I was re-reading an Email from Dolphin Support dated
may explaining Interceptor and Video I would send it but it may break the
list rules. However it mentions DCM and later DOM If when explaining you
can give me an idea of what they actual by do I think the DCM is something
to do with Chaining,I mean the C stands for Chaining. If I understood the
function and why as the Support Email said "some software use incorrect DCM
and that corrupts or messes thing up. The Email sent was for the computer
man meant to be following instructions but who not doing so made a Pigs ear
of it all. Dorothy.
** To leave the list, click on the immediately-following link:-
** [mailto:jaws-uk-request@xxxxxxxxxxxxx?subject=unsubscribe]
** If this link doesn't work then send a message to:
** jaws-uk-request@xxxxxxxxxxxxx
** and in the Subject line type
** unsubscribe
** For other list commands such as vacation mode, click on the
** immediately-following link:-
** [mailto:jaws-uk-request@xxxxxxxxxxxxx?subject=faq]
** or send a message, to
** jaws-uk-request@xxxxxxxxxxxxx with the Subject:- faq
** To leave the list, click on the immediately-following link:-
** [mailto:jaws-uk-request@xxxxxxxxxxxxx?subject=unsubscribe]
** If this link doesn't work then send a message to:
** jaws-uk-request@xxxxxxxxxxxxx
** and in the Subject line type
** unsubscribe
** For other list commands such as vacation mode, click on the
** immediately-following link:-
** [mailto:jaws-uk-request@xxxxxxxxxxxxx?subject=faq]
** or send a message, to
** jaws-uk-request@xxxxxxxxxxxxx with the Subject:- faq
Other related posts:
