INT 2F - CTDEMN - INSTALLATION CHECK                                            
	AX = E77Eh
	BX = 0000h
	CX = 4F4Dh ('OM')
	DX = 5453h ('TS')
Return: AX = 7EE7h if installed
	    BX = resident code segment
	    CX = 6F6Dh ('om')
	    DX = 7473h ('ts')
Program: CTDEMN is a file daemon TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. by Simultan AG