A macro/Subroutine package for parallel programming by RuSty LuSk Sk@anta.mcS.anl.gov>. P4 uSeSmonitorS 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. . E-mail: S.anl.gov>.