How to view the currently opened connections to my server

<body> <center>Sorry you do not have frames enabled. Here is the link of the tutorial:<br> <a href="http://www.onlinehowto.net/Tutorials/Networking/How-to-view-the-currently-opened-connections-to-my-server/487/1">http://www.onlinehowto.net/Tutorials/Networking/How-to-view-the-currently-opened-connections-to-my-server/487/1</a></center> </body>