This guide provides instructions on how to install the Comms server.
For information on what the Comms Server does and why you might need one, please read What is the Comms server?
For information on how the Comms Server fits into the rest of the Maltego server ecosystem, please read the article Overview of Maltego Servers.
Finally, for information on how to work with shared graphs in the Maltego Desktop Client, please read the Collaboration Tab section within the Maltego Desktop guide.