+void arrange(void); /* arranges all windows depending on the layout in use */
+void focusnext(const char *arg); /* focuses next visible client */
+void focusprev(const char *arg); /* focuses prev visible client */
+const char *getsymbol(void); /* returns symbol of enabled layout */
+Bool isfloating(void); /* returns True if floating layout is enabled */
+Bool isarrange(void (*func)()); /* returns True if func is the layout function in use */