How abstract is this though? Can I say take the main menu and do what I like with it? Can I grab the local task menu? Etc. Rather can this be left complete

How abstract is this though? Can I say take the main menu and do what I like with it? Can I grab the local task menu? Etc. Rather can this be left completely to the Window Manager? I.e this is a menu, this is a tab. Now present it as you will.