1.6 Applicability Statement
The DirectPlay 8 Protocol: Host and Port Enumeration is appropriate for use when a DirectPlay Client/Peer has to query multiple DirectPlay Servers/Hosts for their current status, to determine (possibly with the assistance of user input) which DirectPlay Server/Host to connect to, if any.
On IPv4 networks, it is also appropriate to use the DirectPlay 8 Protocol: Host and Port Enumeration when only the IPv4 address information of a DirectPlay Server/Host is known, and the DirectPlay Client/Peer has to discover which port the DirectPlay Server/Host is using. In this case, the DirectPlay Client/Peer sends the EnumQuery (section 2.2.1) message to the DirectPlay 8 server well-known port, as specified in [IANAPORT]. Note that not all DirectPlay Servers/Hosts will respond to EnumQuery messages sent to this port. Nor do all implementations of this protocol support the use of the DirectPlay 8 server well-known port.