well, when i move cursor on blank side of taskbar i noticed a popup windows like i moved cursor on battery or wifi sign, i think that it was hardcoded, if you move on some sign and after you move on blank side you will see popup windows whatever and if you move cursor right or left on blank side you will se other popup windows.
This is my only real gripe with 11. Mostly it stays out of my way, but this is intrusive. And it gets in the way of chat applications frequently. I'd love to be able to disable this, as I don't need this information anywhere but the notification tray.