| A | B |
|---|
| Operating System | controls the operation of the computer |
| Single-Program Execution | executes one application program |
| Multitasking | operating system that handles more than one application |
| Virtual Memory | using disk space to stimulate memory |
| DOS | Disk Operating System/Single-Program |
| Windows | Microsoft's multitasking operating system |
| GUI | Graphic User Interface - Icons |
| Macintosh | Apple's multitasking operating system |
| Unix | multitasking operating system-command line interface |
| Backing Up | copying data to a different medium in case original is lost |
| Command Line Entry | commands are entered by typing on a keyboard |
| Decryption | decoding of data |
| Encryption | coding of data |
| Formatting | prepares the disk surface for storing data |
