[Pierre-Marie Baty]

Yes, because some commands you type in the DS console go directly to the engine, which doesn't bother passing them to the game DLL. This goes for generic commands like "kick", and perhaps "say" indeed. Since these commands are low level commands that are the same for all game DLLs, they are not passing through the game DLL API.. But it's not because you CAN'T hook these messages in the engine<=>gameDLL interface that these messages don't exist. They are simply sent by the engine directly over the network. You can ensure this by using some utility like TCPdump.

Remember how the Half-Life engine works. Every command, every input, everything you type on your keyboard, every move you make with your mouse, be you a client or the server admin in front of his DS console, goes to the engine. The engine then decides if it knows what to do with it, and if so, does its job. In this case, end of the story. If the engine does NOT know what to do with this new input, it passes it forth to the game DLL which is behind, using the API we all know and use, in the hope that the game DLL will know what to do. The game DLL does its job, and the chain is terminated.

Using the gameDLL interface you can only hook those messages which are passing through that interface. In order to hook the others, you'll have to use other methods, such as proxying the whole network traffic between the HL server process and the wire. Personally, I never felt any use in trying these, and my message catching experiences stopped at the gameDLL interface level only, but this is doable. Just a bit harder.