INT 21 - VIRUS - "MG", "699"/"Thirteen Minutes" - INSTALLATION CHECK

	AX = 4B04h
Return: CF clear if "MG" resident
	AX = 044Bh if "699"/"Thirteen Minutes" resident
SeeAlso: AX=4243h,AH=4Ah/BX=FFFFh,AX=4B21h