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Hi Art, I assume Glenn Davis answered your netCDF questions about trying to write to an open netCDF file with several processes or threads concurrently. In general, netCDF was designed for one writer and many concurrent readers, not multiple concurrent writers. It would require some redesign and probably some additional interfaces to permit multiple concurrent writers of the same netCDF file. __________________________________________________________________________ Russ Rew UCAR Unidata Program address@hidden P.O. Box 3000 (303)497-8645 Boulder, Colorado 80307-3000