Editing Alt key (section)

==Alt key pressed alone==
When a user presses the {{key press|Alt}} key by itself on [[Microsoft Windows]], that moves keyboard focus to the menu bar of the application having keyboard focus, and the key is not delivered to the application. In that state, another press of the {{key press|Alt}} key will be delivered to the application.

On other platforms, for example [[Ubuntu (operating system)|Ubuntu]], the {{key press|Alt}} key pressed by itself may invoke another application and not be delivered to the application having keyboard focus. In Ubuntu 16.04, pressing the key opens the HUD, which is an input field that lets the user perform menu commands such as opening a file, or creating a new file.<ref>[https://wiki.ubuntu.com/Unity/HUD Unity/HUD - Ubuntu Wiki]</ref>