NT parallel cluster



Dear CCLers,
 Hi.
 We have 6 computers in our lab (4 running on WINNT and 2 on RedHat 6.0).
 I use the Linux PC's for my computations while the 4 NT PC's stay
 relatively idle. All these PC's are fairly powerful (> 400MHz
 multiprocessor Pentiums) and thus have untapped number crunching power.
 I am wondering if it is possible to build a parallel cluster using these
 4 NT PC's (and better still, using all 6 PC's).
 Almost all network of PC clusters that I read about on the web run under
 Linux. Is there any particular reason for not choosing NT (lack of
 parallel programs perhaps ?).
 I would also like to know if there are any DFT programs (parallel/single
 processor, free/commercial) running on Windows NT?
 Thanks in advance,
 Regards,
 Bhupendra