I decide to start this thread because often people new to PE wonder what they would use it for & whether it is worth buying. You can see which programs are using which ports - so what? When I 1st bought it I only did so for the fun of it. Later I thought it was useless and complained. Since then I have found it to be the best alert system for me that 'something' is using my internet connection 'inadvertently'. OK so you see your internet lights continually being used - 'something' is downloading. 'Something' is accessing your PC and downloading 'something' into it and probably installing it after it has downloaded. Wouldn't you like to know what it was? If you arrived home one night and found the front door of your house wide open wouldn't you be concerned? Would you rather go in yourself or send someone to find out sparing you the possible mess? PE is like that. You find your connection madly downloading 'something' and you can't track it down. It might be legitimate or a dialler preparing itself to use your phone bill. A dialler got into my sister's new PC recently and dialled $100 worth of calls and SHE had to pay the bill. PE could have blocked that dialler from using the connection at all. Then pointed to where the program was so she could have deleted it. Anyway this is how my story goes for those maybe interested in purchasing PE but not sure how or when they'd use it. You use it mainly when you get 'suspicious' to find out 'who's snooping' on you or using your internet connection. PE is a spy against other spies and it's job is to 'blow their cover'. Many times I would notice my internet connection being used, slowing up my browsing and not knowing what was causing it. Thanks to PE I can quickly check if it is a virus, bug, worm, dialler or a legitimate program in which case I know what's going on. This greatly puts my mind at ease since if I don't like the program using the connection I can easily find out what it is and delete it. One example is the new ATI control panel. I noticed since installing it, my connection was being used a lot. Checking in PE showed me that it was ATI and so I uninstalled it and downloaded the other version which doesn't take up all these unnecessary resources. This is just one instance but there have been times when I've found a bug and quickly ran my AV and got rid of it. I like it best out of all the DCS programs because even though at 1st I thought it useless, I now refer to it more than any other DCS program for my peace of mind. I always get worried when my connection is being used and it's not me who's using it and I insist on knowing and consenting to my connection being used remotely so PE gives me more control over what uses my connection. I am now in charge of my downloads not my connection. Programs which 'spy' on you and download other malware onto your PC 'cloak' or 'hide' themselves so you normally can't see them in any Windows program. However, Port Explorer will show you ALL the ports being used even the 'cloaked or hidden ones' which are basically working hidden from your eyes to get their material onto your PC without you finding out until it's too late and they've got what they wanted. Now, I always have Port Explorer ready and on standby in case I notice my connection being used for lengthy periods or without my permission and can check to see if it's a legitimate program or not and block it if it isn't. For me Port Explorer = Peace of Mind Dave Hope this helps.