Int 21 Fn 44E0  U - Sun PC-nfs - API???                                    [N]

   AX = 44E0h
   DS:DX -> ???
   SS:BP -> stack frame (see below)

Return: ???

Note:  this function is also supported by Beame&Whiteside's BWPCNFS shim; the
     description presented here was derived from that shim

Format of stack frame:
Offset Size    Description
 00h   WORD    -> previous stack frame
 02h   DWORD   return address