clear the chat history

is there a way to clear the chat history?

In single player, messages that are displayed through triggers are added to the chat log. You could just spam blank messages until all other chat has been pushed out of it.

If it's multiplayer, then I'm not sure that it's possible.

how about a chat System which filters all commads "-" ???

as much as i know u cannot clear chat. No function for tat, everything written will be displayed.

You can't stop typed text from being displayed in the chat log. No two ways about it.