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copied!<p>I think it could be easier if you set a Mutex when launching second app.<br> In main app you could do this: if Mutex doesn't exist you run second app (which creates Mutex when run and release it when closing), otherwise you skip...</p> <p><strong>EDITED</strong>: You can't edit second app to insert the creation of a mutex, ok.<br> But you can do this in <strong>main app</strong>:</p> <ul> <li>Create a background worker <code>BackgroudWorker wrk</code></li> <li>Set a private bool to true: <code>bool running = false</code></li> <li>Execute wrk when you want the new app run: <code>if (running) return; running = true;</code></li> <li>wrk creates a Process and waits for its end</li> <li>when wrk ends <code>running = false</code></li> </ul> <p>Just an idea...</p> <p><strong>EDITED AGAIN:</strong><br> If you close first app and reopen it, user is able to run second app again.<br> So you could do this:</p> <ul> <li>Create a background worker <code>BackgroudWorker wrk</code></li> <li>Write a tmp file (on NTFS it can be empty)</li> <li>Execute wrk when you want the new app run:<br> if your tmp file exists then exit;</li> <li>wrk creates a Process and waits for its end</li> <li>when wrk ends deletes tmp file</li> </ul> <p>With this method, even if user quits your first app, tmp file remains on hdd; so when user runs first app again, second app will not be executed.<br> Remeber that if user is <strong>smart</strong> enough to undestand this, he could manully delete file and the trick is done.<br> Finally: are you sure user cannot run directly second app?</p>

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