User Activity Utility
The User Activity utility makes it possible for System Administrators to see information about active logged-on users, the applications they use, process server activity, and queue names.
You can also use this utility to send email messages to all active users and to enable or disable all logins. You must disable logins to perform certain maintenance tasks. If all logins are disabled, users with an Admin Security role are still able to log on. This utility is separate from the disable login feature in Security Configuration.