This view lets you see all the currently open connections and other threads running on your server. You can see the owner of the thread, how long it has been running, and what it is doing.
This is useful if you are planning to restart the server and want to know whether any users are currently active. It is also helpful for diagnosing other problems.
If your server is not behaving properly, this view lets you generate a complete thread trace, which you can copy to the clipboard and paste into a support request.