Hi Beowulfer!! I have a question. There is a executed file needed to be run under C shell. Do anybody know how can I do that with Scyld Beowulf cluster? For example: in B shell: NP=2 mpi-mandel .......OK!! in C shell: NP=2 mpi-mandel .......saying "NP=2 command not found"!! Thanks!! Sungyen Lin