Originally Posted by ddhoward
The client does send certain information to the server. If there is a client sided convar that contains information on whether hl2.exe is running in windowed more or not, we could potentially query that cvar and make a determination as to whether or not the client process is full screen.
That's a big if, though.
We are talking about GoldSrc, not HL2. Long time ago was researching about that and havent found anything that can lead to -window detecting (but that was in 2008, probably things have changed since)