This module is a part of the NetHomeServer. The ProntoLamp is when you have a device (for example a radio controlled switch) which is not yet supported by NetHomeServer, but you have the Pronto-codes for the radio signals. Both the AudioProtocolTransmitter and the CULTransceiver supports sending Pronto codes, so this way you may control new devices.
Pronto-codes may be found on the net, but may also be found using the Protocol Analyzer if you have a compatible radio/IR receiver.
the CULTransceiver you can also send the messages as IR if you have a PowerMid