| Key sound context | A mapping between device keys and sound IDs. Defines what
sound to play when a certain key is pressed. Applications can define custom
key sound contexts to override the default context. |
| Key sound stack | A stack in Key Sound Server containing key sound contexts. Only the
topmost context can be active. Applications can make push and pop operations
for sound contexts. |
| Sound ID | Defines an identifier for a Sound Info entry. Application specific
SIDs should be in range [1..999]. System SIDs have values starting from 1000. |
