The title says it all, what is the best way to do this? My best way so far is to send email out before my SMS drops, and then after users forget to shutdown all apps, I come by and fix the aborted install, pointing out my bold sentence in the email about closing down all apps first. This is not very elegant.

Is there a way to produce a screen at the start of ISX (full version) to ask users to please shut down all other apps? I looked through all the built-in ISX features but can find nothing like that. All I want is a messagebox, really. Ideas?