Int 2F Fn 4A13  U - Dblspace.bin - Get ??? Entry Points                    [d]

   AX = 4A13h

Return: AX = 134Ah if supported
       ES:BX -> entry point record (see below)

See Also: AX=4A11h/BX=0000h

Format of entry point record:
Offset Size    Description
 00h   DWORD   pointer to FAR function for ???
 04h  5 BYTEs  FAR JUMP instruction to ???