>I would like to prevent users from opening multiple instances of an application, ideally by switching them to the open app, but at least giving a message and not opening the second instance.
>
>How can I detect that another instance of a VFP app is running? Also, is there some way to switch the user automatically to the open instance?
>
>Thanks,

Isabel,

You might want to look at Create Single-Instance Applications, there's also an update on the Advisor site to look at if the solution is to your liking.