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 (see #3508)
   ES:DI -> control block

(Table 3508)
Values for 3270 Workstation Program host 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