I need a software that recognize who is in front of the computer (windows 7-8)

We need a software that recognize who is in front of a computer. It must run with most of the webcams available, but it's also possible to restrain the compatibility to only Logitech webcams if it will be easier for you. The software will run in background (with a small icon in the windows taskbar). it will say "hello {username}" when it recognizes someone (in a small notification window). it will say "who are you ?" when it doesn't recognize someone. In this case, we can click on the notification window and the software will open up and help us to choose between a list of user or enter a new one. there will be an [login to view URL] file with 2 settings "fileslocation" and "stationname" the fileslocation settings will be path where the main files will be stored. this path will contain : 1) [login to view URL] , a file containing the users names (one line per user, new users are added at the end) 2) a folder "profiles" where you can put the pictures (and all the other files you want) for the face recognition 3) a file named "[login to view URL]" containing the name of the last person recognized (empty file if no recognition) and ";" and the time of the last recognition (format yyyy-MM-dd HH:mm:ss) Feel free to ask questions or make suggestions. Of course, we will need the source code. You can use .NET Framework 4 or 4.5 and VB (you can use C# if you prefer).