We use an XMPP (aka Jabber) server to chat with each other instantly.
Here are the instructions.
1) This link will walk you through installing Pidgin and configuring it to connect with our xmpp server. If you have already installed Pidgin start with Step 3.
make sure to check the box “create new account”
3) Send email to email@example.com. Your account is created but isn’t configured to work with the rest of our accounts. You’ll have to tell us your username for us to add it to the pool.