Here is more than you wanted to know:

Quartz is the 2D rendering technology that Apple developed from a 
NeXTSTEP technology that was built on Display Postscript from Adobe. 
Quartz uses PDF instead of DPS due to development of standards and such 
over time. Quartz Extreme is the 3D rendering expansion of Quartz and 
uses OpenGL technology to expand its rendering capability. If you have 
a DVD movie playing and open a Terminal window, then make the Terminal 
window transparent and drag it over the top of the DVD window you will 
see that both the DVD and the Terminal remain responsive, the DVD does 
not skip and if you have a process [such as top] running in the 
Terminal that it will run without slow down.

This is because neither Terminal nor DVD Player are rendering the 
composite of their graphics/video output. DVD Player decodes the DVD 
video and outputs it, Terminal runs its process and outputs it, but the 
graphics and video rendering is actually done by Quartz, therefore the 
programs do not slow down or become unresponsive because they do not 
have to expend their resources on working with each other to render the 
proper video output.

That is just an example that is easy to see. In reality ALL video and 
graphics rendering is done by Quartz. When you move a window or open a 
menu that is being done, in part, by Quartz. Quartz and Quartz Extreme 
are really background technologies, and yes you use them every day in 
nearly everything you do, its not so much the level of effect they have 
but how close their affect is to the surface. Yes they enhance web 
browsing, yes they enhance iPhoto, iTunes, the Finder, QuickTime, and 
everything else. Do you really "see" the affect unless you know what to 
look for or you set it in an example context [like the DVD 
Player/Terminal example], no, not generally.

And yes, your PowerBook will support all of this functionality very 
well.

David

On Thursday, March 13, 2003, at 12:17  PM, w appling wrote:

> RE; Hi all, Im sure this has all been covered however I still do not
> fully understand Quartz Extreme,
> I think My 800 TI powerbook with 8500 video card will handle it, but
> what does it do? Is it only for rendering such as a graphics
> enviroment? or does it do anything during just normal home use such as
> I-photo?or web browsing.?
> Im sorry to bore with repeating this, but I didnt have a compliant
> machine until recently..
> thankyou all


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