Apple allows users to define keyboard shortcuts for just about any command in a menu (if you spell it exactly right). You will see the shortcut displayed next to the command in its menu. For example, I use control-option-commmand+up-arrow to move a window to the upper monitor and the same with down-arrow to move it down. Tends to work like a charm — unless you are using Acrobat Reader DC, that is. Those keyboard shortcuts do not display when Reader DC is being used. No other app I use does this. Very annoying as I have to use Reader DC daily. I think this is a bug in that the app is not paying attention to something in the OS that it should be. Right?