I figured a good way to install an application on multiple machines, is to put instructions for it in the login script that these machines use. However, this way the application will be installed every time the user logs on. What are some good ways of detecting if the application has been installed yet? (and if so: skip the installation) Perhaps checking for specific registry entries, or files that are unique to that version of a certain application.... Anything else? How would you do it? (code please )