(prev-window #&key (window (get-window #f #f)) (only '()) (except '()) (proc window-list-proc))
Circulate to the previous matching window. If WINDOW is given, circulate to that window. ONLY and EXCEPT control which windows match --- see list-windows for details. PROC is a procedure of one argument which does the work after the windows are circulated. PROC defaults to window-list-proc. See also next-window.