Following are the functions used with communications devices.
BuildCommDCB
BuildCommDCBAndTimeouts
ClearCommBreak
ClearCommError
CommConfigDialog
DeviceIoControl
EscapeCommFunction
GetCommConfig
GetCommMask
GetCommModemStatus
GetCommProperties
GetCommState
GetCommTimeouts
GetDefaultCommConfig
PurgeComm
SetCommBreak
SetCommConfig
SetCommMask
SetCommState
SetCommTimeouts
SetDefaultCommConfig
SetupComm
TransmitCommChar
WaitCommEvent