TIdDiscardUDPServer implements a UDP-based server for the Discard Protocol (RFC 863). TIdDISCARDServer is a useful debugging and measurement protocol where the data sent to the server is simply discarded.
DefaultPort is an Integer property that represents the default port number for listening and accepting client connections to TIdDiscardUDPServer. DefaultPort is redefined in TIdDiscardUDPServer, and the value IdPORT_DISCARD is assigned in the Create constructor.
Create is the constructor for the object instance, and calls the inherited Create method to instantiate a new TIdDiscardUDPServer component. Create sets the value of DefaultPort to the standard port number used for thye Discard protocol (IdPORT_DISCARD).