| English | German |
| cellular operating system | Mobilfunk-Betriebssystem |
| client-server operating system | Netzwerkbetriebssystem |
| network operating system | Netzbetriebssystem (LANs) |
| operating support system | Betriebssupportsystem |
| operating system | Betriebssystem (computer, e.g. MS-DOS, UNIX, CP/M, OS/2) |