AppleScript: access selected files in all Finder windows

Hello,
a quick question from an AppleScript noob.

I'm aware of the typical AppleScript syntax "tell application "Finder" to set list to selection", which loads list with the selected files in the front Finder window.

Is there a way to get the selected files for ALL open Finder windows, without changing the front window?
Perhaps through "System Events"?
Perhaps with JavaScript (which I do not know at all)?

Thank you,
Jan