Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Pakati pemakore ekuma1980, Microsoft neIBM vakaumba chirongwa chakabatana chekugadzira chizvarwa chinotevera che graphical operating system; mhedzisiro yaive OS / 2 uye HPFS. Nemhaka yokuti Microsoft yakanga isingabvumirani neIBM panyaya dzakawanda dzinokosha, pakupedzisira vakaparadzana; OS/2 yakaramba iri purojekiti yeIBM uye Microsoft yakashanda kukudziridza Windows NT neNTFS.  Mubvunzo: Muchirongwa chipi umo Microsoft neIBM vakabatira pamwe pakati pama1980?
OS/2 uye HPFS