TIORequest

type TIORequest = packed record

  io_Message: TMessage;

Message structure

  io_Device: PDevice;

Pointer to the device to use

  io_Unit: PUnit;

pointer to unit (depends on device)

  io_Command: Word;

Command send to device (CMD_*)

  io_Flags: Byte;

Device flags, different for every device.

  io_Error: ShortInt;

Device error messages, different for every device.

end;