Int 2F Fn B704  - Dos 3.3+ Append - Get Append Path                        [f]

   AX = B704h

Return: ES:DI -> active APPEND path (128 bytes max)

Note:  some versions of append do not support this call, and return ES
     unchanged; in this case, you should call AX=B701h to get the APPEND
     path

See Also: AX=B701h