2F99 INT 2F U - Micro Focus COBOL v3.1.31 internal - ???
2F9900 INT 2F U - DOS Navigator II - INSTALLATION CHECK
2F9901 INT 2F U - DOS Navigator II - RETURN POINTER TO COMMAND LINE
2F9902 INT 2F U - DOS Navigator II - SET 'TRUE' EXIT CODE OF DN.PRG
2F9903 INT 2F U - DOS Navigator II - SPECIFY HOW TO EXECUTE COMMANDS
2F9904 INT 2F U - DOS Navigator II v1.49 - SET ???
2F9905 INT 2F U - DOS Navigator II v1.49 - GET ???
2F9906 INT 2F U - DOS Navigator II v1.49 - GET ???