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| Subject | English | Thesaurus |
| IT, abbr. | Operating System / Primary Control Program | OSPCP (IBM, OS, OS/360, Vorlaeufer) |
| IT, abbr. | Operating System / Primary Control Program | OS/PCP (IBM, OS, OS/360, Vorlaeufer) |
| IT, abbr. | Primary Control Program | PCP (IBM, OS, OS/PCP) |