native client_print(index, type, const message, any:...);
Client index, use 0 to display to all clients
Message type, see print_* destination constants in
Variable number of formatting parameters
Sends a message to the client.
This functions return value behaves differently depending on what is
used as the client index: If 0 is specified, then the function will
return 0 if nothing has been sent (no client connected). If either a
single client is specified or there is at least one client connected,
the number of printed characters will refer to the message that is sent
last, to the client with the highest index.
Number of printed characters
If a single client is specified and the index is not within
the range of 1 to MaxClients, an error will be thrown.