A macro/subroutine package for parallel programming by Rusty Lusk <[email protected]>. P4 uses monitors on shared memory machines and message passing on distributed memory machines. It is implemented as a subroutine library for C and Fortran. An enhancement of the "Argonne macros", PARMACS.ftp://info.mcs.anl.gov/pub/p4t1.2.tar.Z. E-mail: <[email protected]>.