DOS Fn 2fH: Query Disk Transfer Address (DTA)

                                                         Compatibility: 2.0+ 
 Expects: AH    2fH
 Returns: ES:BX address of the start of the current DTA
    Info: Returns the address of the start of the Disk Transfer Address.

          Since the DTA is a global value for any process, in recursive
          procedures (as when traversing a directory tree), you may need
          to use this procedure to save the DTA, then set it back via fn
          1aH (set DTA).

          You should also use this when saving the state of the system
          before popping up as a TSR.

See Also: Fn 1aH (set DTA)
          TSR/Popup Functions
          DOS Functions