| Subject | English | Hebrew |
| comp., MS | Microsoft Disk Operating System | מערכת הפעלת דיסק של Microsoft (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |
| comp., MS | MS-DOS operating system | מערכת ההפעלה MS-DOS (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |
| comp., MS | operating system | מערכת הפעלה (The software that controls the allocation and usage of hardware resources such as memory, central processing unit (CPU) time, disk space, and peripheral devices. The operating system is the foundation on which programs are built) |