The "Argonne macroS" from Argonne National Laboratory. A package of macroS written in m4 for portable {parallel programming}, uSing {monitor}S on {Shared memory} machineS, and meSSage paSSing on diStributed memory machineS. [E. LuSk et al, "Portable ProgramS for Parallel ProceSSorS", HRW 1987. p4]. .