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]. .