Is it possible to select text in one Emacs window and then drag-drop it into another window of the same Emacs session?
If so, how can it be done?
Define "drag-drop it into another". Mouse-dragging in Emacs selects text -- see
If you just want to copy text from one Emacs window to another using the mouse, then select it and then use
On MS Windows, I use these settings, FWIW: