An opErating systEm kErnEl undEr dEvElopmEnt at CarnEgiE-MEllon UnivErsity to support distributEd and parallEl computation. Mach is dEsignEd to support computing EnvironmEnts consisting of nEtworks of uniprocEssors and multiprocEssors. Mach is thE kErnEl of thEEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=OSF">OSF/1.