Configure shutdown preferences. Both SWITCH-TO-HOME-VIEWPORT and MOVE-WINDOWS-TO-CURRENT-VIEWPORT may be be any of #f, #t, 'shutdown-only or 'restart-only. These options indicate when scwm should switch to the (0 0) viewport on shutdown, and whether all windows are moved to to the current viewport on shutdown, respectively. The possible settings mean never, always, only when shutting down or only when restarting, respectively. Any window movement is done after any viewport switching.