Groups of related functions in the multimedia extensions are identified by a prefix in the function names. The following table summarizes groups of related functions and the prefixes for each group:
| Function Prefix | Description |
| aux | Auxiliary audio functions |
| joy | Joystick functions |
| mci | Media Control Interface functions |
| midi | Low-level MIDI audio functions |
| mmio | Multimedia file I/O functions |
| mmp | Movie playback functions |
| snd | High-level sound functions |
| time | Timer event functions |
| wave | Low-level waveform audio functions |