maxplayers is a console variable available in all Source games.maxplayers is a server console variable that determines the maximum number of players that can join a game. It cannot be changed while a server is running.
The engine can be put into single-player mode by setting maxplayers to 1 before a game starts. This bridges the normal client-server divide in several areas, eliminating latency and interpolation and opening backdoors like the one used by the inverse kinematics system.
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