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Int 7A Fn 09  - IBM 3270 Workstation Program API - Host Services           [I]

   AH = 09h
   BX = request type (4000h async, 8028h synchronous)
   CX = 0000h
   DX = ID of MFIC
   AL = service
      01h connect to host
      02h disconnect from host
      03h read DFT structured data from host
      04h write DFT structured data to host
      05h create a host buffer
   ES:DI -> control block
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