Multi Touch TUIO Hardware

i want to do a project with a touch interface.
I have limited space and need to build a custom interface, so i figured out it would be best to go for a customer touch screen.

TUIO is a protocol standard for multi touch hardware.
Are there better ones to use with vvvv?

I read about a maximum of two recognized objects with TUIO. Is this also a industry standard or are there models that support more?

If not, do these devices track the two latest contacts or do they stick to the two that made contact in the first place?
For example, if i put right hand on the screen and the start tapping with two fingers from my left hand… would it recognize the two fingers?

best regards
yours truly, the schlonz

this hardware is doing TUIO AND sevn multitouch protocol