As usual, overlord Rayhawk is right, though I think there should only be one-ish commanding fig at any time, whos orders are yelled around all minifigs.
when the order reaches a fig with comms equipment the order is transmitted to all others with one, who then yells it to the other figs he can yell to.
I've created a nice pic for easy clarification. with colors!
http://hyves.nl/index.php?l1=ut&l2=phot ... ecret=8uy3
as you can see, all blue troopers are connected with eachother. if you want one to do what you want all you have to do is make sure he is connected with your commander. the infiltrators 1 squad can follow orders because the commanders is linked through the radio, while infiltrators 2 had their radioguy shot, so they arent very usefull until they get their radio back online. if the radio was shot along with the commsguy theyd be in serious trouble, and the blue player would have to reestablish contact by moving a trooper along the yellow arrow. the same applies to the trooper with the black arrow, he wandered too far away from the main force with only one man linking him, and the enemy took advantage of that. note that the ninja does not have any links, because hes too damn awesome.