Synapse and Multiple Arduino Rovers

I have an idea for a project. Basically I have two Arduino rovers and I connect to them wirelessly with a synapse for the basic embedded code controls WASD for movement which is working great.

Currently 1 synapse gives 2 rovers the same commands.

The project I am looking at, is having the synapse give two rovers different commands.

The parts I'm working with are a couple Synapse RF266PC1 - 2.4GHz (chip antenna) - WRL-11279 - SparkFun Electronics a SparkFun XBee Explorer USB - WRL-11812 - SparkFun Electronics and two http://www.robotshop.com/en/dfrobotshop-rover-tracked-robot-basic-kit.html

I believe I'll need a new code for the synapse...
I'm not quite savy enough to know where to go from here with this. If anyone has run into this sort of thing before any direction would be appreciated.

Thanks!!