2184 INT 21 - VIRUS - "SVC 5.0" or "SVC 6.0" - INSTALLATION CHECK
218400 INT 21 - European MS-DOS 4.0 - "CREATMEM" - CREATE A SHARED MEMORY AREA
218401 INT 21 - European MS-DOS 4.0 - "GETMEM" - OBTAIN ACCESS TO SHARED MEMORY AREA
218402 INT 21 - European MS-DOS 4.0 - "RELEASEMEM" - FREE SHARED MEMORY AREA