DOS / Interrupts / Int 2F / B7/02


                             APPEND - Get Version

Input	DOS1	N	DOS2	N	DOS3	Y	DOS5	Y	Output
AX	B7h		02h		Version Flag / Error Code				AX
BX									BX
CX									CX
DX									DX
ES:DI					Set if Error				CF

Version Flag:   0FFFFh = MS-DOS V4 APPEND
                else     Not MS-DOS V4