Yes, the framework provides the libraries and runtime environment for the dll to run. When you create the setup project in visual studio, you can add a condition to check on the target machine. In this, add a condition mentioning that the required version of .net framework is installed; providing a location on MS site to get it if its not already installed. However, in most cases, you can expect it to be installed either by default or as part of some service packs Windows XP SP3 will have .net 3.0 installed Windows Vista comes with 2.0 pre-installed; SP will install further Windows 7 comes with 3.5 pre-installed

http://www.codeproject.com/script/comments/forums.asp?forumid=1640&select=1756009&df=100#xx1756009xx it may be helpful

Hi, It seems to me that you are describing a scenario where you want the web application to check if a certain condition is matched on the server side (in this case the ip and port). If so, the client should get a pop-up. If I understood this correctly, you could use AJAX. AJAX allows you to add code on the client to constantly (without a great penaulty) check with the server if a certain condition was matched. There are several websites out there introducing the concept of AJAX. Even my website www.kynou.com has some introduction tutorials about it. I also have a chat room in my website where I try to spend a lot time there. Try to find me there so that you can give me more details about or email me contact@KYNOU.com :)

you would want a system DSN anyhow. Web site users can change. systems wont 1 line of code equals many bugs. So don't write any!!