Hi,
I'm assuming you're using a PPT system for tracking? To track two points you simply add the ppt sensor twice. Here's some sample code:
Code:
head = viz.add('vizppt.dls')
hand = viz.add('vizppt.dls')
print 'Head position',head.get()[:3]
print 'Hand position',hand.get()[:3]
As long as you don't place the head and hand sensor too close to each other, the ppt system should be able to distinguish between them.