INT 2F U - DOS 3.3+ APPEND - GET VERSION INFO                                   
	AX = B710h
Return: AX = current APPEND state (see #02980)
	BX = ??? (0000h in MS-DOS 3.30 and 5.00)
	CX = ??? (0000h in MS-DOS 3.30 and 5.00)
	DL = major version
	DH = minor version
SeeAlso: AX=B700h,AX=B702h