INT 16 U - PCIBM PC Tools v7-8 DATAMON, v9+ DPROTECT - INSTALLATION CHECK
	AX = FFA3h
	BX = 0000h
	CX = 0000h
Return: AX = segment of resident code
	BX = 5555h
	CX = 5555h
Note:	also supported by DOS 6 UNDELETE which is licensed from PCIBM PC Tools
SeeAlso: INT 21/AH=3Fh"NB.SYS",INT 21/AX=4101h,INT 2F/AX=6284h