Log files store information about the globally unique identifiers (GUIDs) of the clients that connect to your server in the c-playerID field. This information can be useful for tracking client activity. You may encounter the following types of GUIDs in your log files:
3300AD50-2C39-46c0-AE0A-xxxxxxxxxxx,
where
xxxxxxxxxxx is
replaced by the session ID of
the client. The session ID of the client is a randomly generated
value that the server assigns to the client when it connects.