Does Snow Leopard use all cores??

[AdamZx3]

I noticed that when my MacPro is running InDesign CS4 and Acrobat 9 (in leopard), they only use 100% of a core, leaving the others unused. Would this be fixed in Snow Leopard? Or is this something that is limited by the software? I was hoping the grand central station or w/e in 10.6 would fix this.

I think the only program that I currently use that takes close to all cores is handbrake for video encoding.