The following functions are used with communications devices:
BuildCommDCB
ClearCommBreak
ClearCommError
DeviceIoControl
EscapeCommFunction
GetCommMask
GetCommModemStatus
GetCommProperties
GetCommState
GetCommTimeouts
PurgeComm
SetCommBreak
SetCommMask
SetCommState
SetCommTimeouts
SetupComm
TransmitCommChar
WaitCommEvent