You should get the same result using links:
Code:
import viz
import vizshape
import vizact
viz.go()
grid = vizshape.addGrid()
vrpn = viz.addExtension('vrpn7.dle')
hl = vrpn.addTracker( 'Tracker0@localhost',8)
hr= vrpn.addTracker( 'Tracker0@localhost',14)
handLeft=viz.add('hand_left.cfg')
handRight=viz.add('hand.cfg')
linkLeft = viz.link(hl,handLeft)
linkRight = viz.link(rl,handRight)