Client indexes start at 1 so it'd be <= MAXPLAYERS or MaxClients. Listen servers start at 0, but it's not a case you should take into consideration since clients shouldn't be hosting on listen servers.
*Edit: Rather, you should use MAXPLAYERS + 1 for declarations inside the global scope, MAXPLAYERS within OnPluginStart, and MaxClients for anything afterwards.
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Last edited by thetwistedpanda; 09-17-2013 at 21:48.