Stopping players from directly chatting

[Alakon]

Does anyone know how I can stop Players from being able to directly chat each other in the game?
So that anything they type will only be shown on their screen?

 

[emperor_d3st]

http://www.wc3campaigns.net/showthread.php?t=80691

 

[Alakon]

Thanks. I tried using search but it didn't help.