Check Active Comm-Ports Class uses the mode command to retrieve the list of active communication ports. An array is used to return the list of active ports and their names. Requirements: PHP 3.0 or higher

The user id, login and last access date and time can be stored in session variables of a registered session.Session Manager Implementation can also check whether an user session is active if its last access occurred in the last 5 minutes. In that case the last access date and time is updated to the current date and time.Requirements:PHP 5.0 or ...

Browzin'! lists active users of your site over a specified period of time. Everything can be configured to your taste. It currently uses a MySQL database on backend but a text-only version will be released in the near future.