A task sends commands using the IOInfo data structure to a device. The IOInfo.ioi_Command field is set to the command a task sends to a device. In addition to the command, some devices allow the task to specify options to the command. The options are set up by defining the IOInfo.ioi_CmdOptions field. The IOInfo.ioi_Send and IOInfo.ioi_Recv substructures must also be set for the information to be sent to the device and to receive it back from the device. The reference sections that follow provide detailed information about the commands and command options, and send and receive buffers that a task uses to communicate with a device.