21C500 INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - OPEN SEMAPHORE
21C500 INT 21 - VIRUS - "Sverdlov" - INSTALLATION CHECK
21C501 INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - EXAMINE SEMAPHORE
21C502 INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - WAIT ON SEMAPHORE
21C503 INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - SIGNAL SEMAPHORE
21C504 INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - CLOSE SEMAPHORE