INT 2F U - NORTON UTILITIES 5.0+ TSRs - internal - ??? AX = FE03h DI = 4E55h ("NU") SI = TSR identifier (see AX=FE00h) Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h) AX = status 0006h successful??? Notes: only supported by DISKMON, FILESAVE, and NCACHE-x reportedly dangerous