If you mean will RDC client use two (or more) monitors, the answer is
no...sort of. The RDC client in full screen mode only uses one monitor.
However, you can set the Display options to something other than full screen
and then move the RDC "window" to any monitor, as you would any application
window. I always have my RDC in a window with other applications open on the
other monitors (e.g.: Outlook.)