[nvda] Re: video system hooks

I like the idea of it been portable so video hooks would be better I think as it would still allow me access to our libraries where we can't install video intersepters been locked down.. 

Maybe down the track there may be both

Gene NZ

On 29/05/2009 5:18 a.m., kendell clark wrote:
This is because jaws uses what is called video intercept, or display chaining. it is not portable because in order for it to run the display chaining manager, or dcm has to be installed on the computer it is running on. If nvda gets display hooks it will not affect it's portability. display hooks are quite different from display chaining. instead of capturing video information before it reaches the video card itself, display hooks capture the information the application is sending to the video card and then passes it on to the video card. it does not rely on any special software to be installed. it doesn't need any. Nvda will use this method, rather than display chaining for this reason. 
Thanks
Kendell clark
On 5/28/2009 12:11 PM, developer wrote:

do you know example of jaws.
jaw is not portable with system hooks
so system hooks
bye bye

    ----- Original Message -----
    *From:* Josh <mailto:jkenn337@xxxxxxxxx>
    *To:* nvda email list <mailto:nvda@xxxxxxxxxxxxx>
    *Sent:* Thursday, May 28, 2009 4:02 PM
    *Subject:* [nvda] video system hooks

    Hi,
    video system hooks will not decrease portability. System access
    is a good example of a portable screen readerwith video system
    hookss.
    Josh
    Josh email is jkenn337@xxxxxxxxx <mailto:jkenn337@xxxxxxxxx>
    msn: kenn6498ku@xxxxxxxxxxx <mailto:kenn6498ku@xxxxxxxxxxx>
    skype: jkenn337



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