When you know what display you want apps to start by default you would do something like:
export DISPLAY=localhost:0.0
But suppose miss daisy, which is a frisky windows user that is giving linux a chance, is trying to figure out the available displays values she can set this variable to. She probably expects something like localhost:0.0 0.1 1.0...
How does Miss Daisy query such basic information about her system in the command line?
