Comment 6 for bug 1384508

Yes, if you have the option to close to tray icon enabled, Deluge stays active, but you can't reach the window, while the icon doesn't show up -- system monitors will list Deluge as running. But when you run Deluge again from its launcher, it won't open a second instance, but simply activate the hidden active window. So technically it IS reachable that way... So I am not totally sure how to answer to your question.