Creating Chatbox which sends text to a different application

I wish to create (like the topic suggest) a chatbox which could send some of the text online, so people can chat to the player(s) through another application. the functionality of it is basically so I can let people test my game, and chat to me if necessary through the chatbox.
preferably that they can only chat directly to me by typing some command beforehand like "/atc" for alphaTestChannel.

any suggestions on how I can achieve this? is it even possible?

EDIT: spelling mistakes