Game UserMessages (Source)

In addition to events, Source games use UserMessages to send messages from the server to clients.

There are two types of UserMesssage: BitStream UserMessages and Protocol Buffer UserMessages. BitStream UserMessage names can be retrieved using the Metamod: Source "meta game" command. However, this will not give you the type and order of the arguments being sent to the client.

Protocol Buffer UserMessages are well-documented in .proto files included in the game SDKs.

Games that use BitStream UserMessages

• Counter-Strike: Source UserMessages
• Day of Defeat: Source UserMessages
• Half-Life 2: Deathmatch UserMessages
• Left 4 Dead UserMessages
• Left 4 Dead 2 UserMessages
• Nuclear Dawn UserMessages
• Team Fortress 2 UserMessages

Games that use Protobuf UserMessages

• Counter-Strike: Global Offensive UserMessages
• DOTA 2 UserMessages