CISSUE@

Issues a DOS command.

EXIT@

Terminates a program.

EXIT

Terminates a program.

GET_KEY_OR_YIELD@

Gets the next keycode.

SLEEP@

Suspends program execution for a specified time interval.

START_PROCESS@

Creates a new process.

START_THREAD@

Creates a new thread.

WAIT_FOR_THREAD@

Waits for a given thread (or all threads) to end.

LOCK@

Protects memory accessed on more than one thread.

UNLOCK@

To release a lock on memory shared by different threads.