Note, a paltry 58 people clicked this link when we posted this story back in July. Hundreds of people visited Paul T's story of the day about XP SP1 Rumors, though.
SQL Server 2000 and MSDE 2000 introduce the ability to host multiple instances of SQL Server on a single physical machine. Each instance operates for all intents and purposes as though it was a separate server. However, the multiple instances cannot all use the standard SQL Server session port (TCP 1433). While the default instance listens on TCP port 1433, named instances listen on any port assigned to them. The SQL Server Resolution Service, which operates on UDP port 1434, provides a way for clients to query for the appropriate network endpoints to use for a particular SQL Server instance.
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