RCA Lyra Wireless RD900W Question

[Chunce DeLeone]

Been looking at a couple of really affordable used sets of RCA Lyra Wireless RD900W's and was wondering:  Will the PC be able to produce audio to a pair of powered speakers connected to the line out of the internal pc soundcard, as well as push audio out to the RD900W's "virtual sound card" at the same time?  What I am looking for is local sound right at the Juke and the option to also push it out to the home sterio simutaneously.  What is bothering me is that I have heard round hear that WinXP will only do one soundcard at a time and the RD900W looks like it would act like a second soundcard.