Thanks all for the great feedback.  I believe that I have the answers to what I need.  I do have 2 children and they each want to control throttle and sounds of their respective trains at the same time.  I do have 2 tracks (An Outer Main line and an Inner figure eight with a train yard).  So I believe I can do the following:

1) Hook up my DCC Command Module that came with my set to the track.
2) Purchase the DCC Walk Around Companion and hook that up to the Main DCC Command Module, NOT to the track.  This will allow me to provide throttle control to the 2 trains and provide the main DCC Command Module to one of my children and the Walk Around Companion to my other child to control his train.
3) If I want to create a auto reverse loop, I can purchase ONE Reversion Module and a pack of HO insulating rail joiners.  Create an extension to my current layout and add this loop as specified in NarrowMinded's instruction.  This will allow me to reverse the trains on one of the lines if I want.

Once again, thanks to all the quick feedback.  I think I will stick with the Bachmann DCC Commander for now, since this is mainly for my children, but as they get older and we expand I will probably upgrade the DCC control to something else.

Tom

I have a new train set that we purchased with 2 DCC equipped engines, along with an expansion track pack.  It came with 1 controller.  I have 2 children and they would both like a controller to controller their own train.
1) Can this be done with DCC?
2) If so, what is the model number of the additional controller I need to purchase so that I can have 2 controllers.
3) I am assuming it would be straight forward to hook up the 2 controllers, but if not, is there something I should know about before doing this?

Secondly, I want to hook up an automatic reverse loop module, but some books I read say you need to have some Gap Tracks?
1) Does this come in the Easy Track?
2) What is the model number for this?
3) Where do these gaps need to be (I am assuming right after the switch or something.


Thanks for your help,
Tom