-ACTION="$(echo "$_GET[\"action\"]" |egrep '^[a-zA-Z0-9_-]+$')"
-ACTION="${_EXEC}/actions/${ACTION}.sh"
-[ -x "$ACTION" ] || echo -n "Location: ?page=error\n\n"
-
-. $ACTION
+echo -n "Content-Type: text/calendar;charset=utf-8\n\n"
+course="$_GET[\"course\"]"
+cat "$_DATA/ical/$course"