Comskip can be used standalone or as part of a PVR where it will be run automatically after each recording to detect the commercials. Comskip will generate an output file in some of the many supported formats to enable automatic skipping of commercials during playback or to enable an automatic editor to remove the commercials from the recording.
First there is the download site containing documentation at http://www.kaashoek.com/files/
This forum can be used to ask support questions or to give feedback but I suggest you do read the provided documentation before asking questions.
Information on how to use Comskip in combination with various PVR softwares can be found here: