Monitoring/Recording PC sound (from say i tunes)

[bigtim]

I am certain that this is a dumb question but its late and I'm stuck

Just set up a new Edirol FA101 and all is good in the world. One minor drawback is the edirol has no software mixer. Thats ok I think I'll set up reaper as a mixer and again all good my gutar effects, synths all the i/o from the edirol set up as tracks ready to mix.

Now I play along to itunes, cds etc which I play on the pc obviously, so here's the question, how on earth do I route the pc audio which is playing via the edirol through reaper?

I guess another way of asking the question is can I record I tunes or the like in reaper ???

Tim