Chatting with other webmasters in the dashboard

I was wondering if there is an efficient way to communicate directly with a co-worker in another part of the country when and if we happen to be working on the same page or post in WordPress inadvertently.

Through the development process, it has happened that we are both on the same page, and while there is notification that someone else is editing the page, there’s no way to know if they just left it open and forgot about it or if they’re really working on it.

Without pickup up the phone, sending a popup message or chatting would be nice, through the dashboard.