Run the following script and you can chat with people on the same domain as you:
Menu item: Tools > Local Chat… shows / hides window.
Or press “” to show and Esc to hide (if the window has focus).
Click on the chat window to give it focus; click elsewhere and it loses focus.
The cursor in the input pane flashes when it has focus.
Press Ctrl+\ to bring up the IRC link window instead.
It’s an interim solution that uses one Web application to service everyone using the script.
It simulates local domain-specific chat by restricting messages sent/received to be on the same domain as you.
It isn’t scalable in its current incantation.
And it isn’t secure or encrypted or anything.