Allow an NSWindow (NSPanel) to float above full screen apps

Question

I\'m trying to add a little window that provides \"quick input\" from any place in the system to the main app.

The user could hit a hotkey, the window pops up, and float

Answer 1

The Swift 3.0 version of your self-answer is

window.level = Int(CGWindowLevelForKey(.mainMenuWindow))
window.collectionBehavior = [.canJoinAllSpaces, .fullScreenAuxiliary]