From what I've heard, if you are using and installer tool (like Wise or Install Shield) they allow you do this automatically.

Microsoft distributes a bootstraper sample app that shows how to do it. Here are a few links that I collected over time and thought have good information on the subject.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetdep/html/redistdeploy.asp

http://www.codeproject.com/managedcpp/dotnetsetup.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconusingsetupexebootstrappersamplewithapplication.asp



>Waht do users have to have on their machine to run .net apps? What's the best way to test for it?