I have 2 generators running 2 different things simultaneously - how do the 2 different programs get to the hand wands or Tens pads at the same time? Do I have to hold the wands and have tens hooked up?

It's not suggested to use both of generators for contact mode. When you have more than one generator, the other generators typically use the Spooky Remote to give yourself (or others) a treatment.

For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=66&t=4991&p=45273#p45273