Its a Toshiba, a couple years old. I think the main reason is because it was a Vista machine that I reverted back to XP (for obvious reasons) and not all the hardware plays along 100%. I have a mac pro as well in my studio, but I try not to use it for anything other than audio.
I'll look into apps, there doesn't appear to be any info for 4S yet...but I'm sure soon app info will be updated