Sorry for the confusion, @devoy, sometimes I remember to call them Desktops/Workspaces. Both Apple's doc and UI are pretty inconsistent. Mission Control calls them Desktop 1, Desktop 2, etc.
@ccstone / Chris, are you serious that AppleScript cannot see other Mission Control Desktops? That's absurd. And, unfortunately, I believe you. Do you know how to tell what is an AppleScriptable app and what is not? For instance, just this week I started using a new Markdown Editor called Typora. How could I look up somewhere or test if it is AppleScriptable?
I currently have 21 Desktops/Workspaces between two monitors. (I don't want to try imagining how to live without them.) I also currently have 23 TextEdit windows open. Using the Windows menu in TextEdit, I can get a list of the filenames, but it doesn't show me which Desktop/Workspace each one is in. That's what I was hoping I could entice KBM to do for me.
I guess I'll just have to step through each of 21 desktops and generate a list of what window are open and then filter, sort, and format the combined list into something useful. Definitely not a sweet solution.
But that just begs the question, How to List All Open Windows on a Desktop
Thanks.