Note that the 'port' is a special 'udp reception port', not the usual port that players use to connect to the mud. The GD allows only the master object to send udp messages. Among the more important is the keeping track of the known muds. There is commands for the managing of this, 'mudlist', 'storemuds', see help on these. Every message sent is printable strings.
Every message consists of a 'command' and 'parameters'.
Paramaters can have subparameters. The motivation for this design is the simple translation of a message into a mapping of parameters. The parameterlist is then put into a mapping using the tags as index. The values of the mapping can then be either a string or another mapping holding the subparameters. The extendibility of this protocol is evident.