I hope this question isn't silly, however, can one use 2 CS's on one layout ? This way I could have one MS attached to the 2 CS's nd then be able to control 6 locos at the same time.

Greg, at this time you cannot connect 2 CS units together, and the only way you could have 2 CS controlling a layout is if they are electrically isolated from each other, i.e. each CS controls half of the layout each. However, the passing of control of a locomotive from 1 CS to another would not be possible.

You would be better off with a single CS connected to a PC running train control software such as LocCommander, from which you can control as many locos as you can physically display on your PC monitor.

http://users.telenet.be/loccommander/

Another way:
It should also work to have one CS ("slave") connected to the sniffer port of another CS ("master").
I presume you can only use the slave CS with MM protocol so your limited to 255 addresses with 5 functions each. You can only control locos that have a sniffer address configured on the master CS.

I ne'er tested the sniffer, but the GUI allows addresses up to 9999 IIRC.
I think the sniffer was designed to support all Märklin Digital boxes, so solenoids should work, too.

Your better option is to have multiple MSs as throttles using a single CS as command station for the layout.
Redirect the money for a 2nd CS into boosters.

Thanks fellas, that really is great help. Very much appreciated.
The summary as I would handle the situation, is to adopt the simpler approach and that is to have one CS a with muliple MS's and hook it all up to a PC. This was my original thought, however, I thought it was worth a shot with 2 CS's, but the isolation feature would degrade the "working layout", i.e. not as exciting as trains crossing in front of each other with one hand hovering over the emergency stop !!!!! Also, with the 1 CS & many Cs's it would be cheaper, i.e. expensive instead of exorbitant . The only thing left is to "hide" the costs from the "trouble & strife" (wife") [:I]