+ One of @c wxSHUTDOWN_POWEROFF, @c wxSHUTDOWN_REBOOT or
+ @c wxSHUTDOWN_LOGOFF (currently implemented only for MSW) possibly
+ combined with @c wxSHUTDOWN_FORCE which forces shutdown under MSW by
+ forcefully terminating all the applications. As doing this can result
+ in a data loss, this flag shouldn't be used unless really necessary.