[R] Running DOS command prompt from R 2.0.1 Windows?

[Mr Toby Daniel Ahrens]

I am trying to use R (windows version 2.0.1) to manage runs of a program
that is run from a DOS command prompt.  Is R able to call a DOS prompt?  I
am hoping that there is something analogous to the "spawn" command in IDL,
but I can't see to find any help in the R archives...

Thanks very much,

Toby