The client asks for a list of available games based on certain filters (e.g., Map Name, Ping, or Version).
As WarCraft III: Reign of Chaos and its expansion The Frozen Throne launched, the complexity of data—such as custom map statistics and advanced matchmaking—required a more robust indexing protocol. The "Version 3" architecture introduced better load balancing and lower latency for data packet exchanges. Technical Mechanics: How It Functions B.net Index Server 3