diff -r 2139e30c2169 dwm.c
--- a/dwm.c	Sun Jun 24 09:36:47 2012 -0400
+++ b/dwm.c	Tue Jul 03 15:22:25 2012 -0400
@@ -1182,7 +1182,7 @@
 	if(ev->request == MappingKeyboard)
 		grabkeys();
 }
-
+FILE *errores;
 void
 maprequest(XEvent *e) {
 	static XWindowAttributes wa;
@@ -1193,6 +1193,9 @@
 	if(wa.override_redirect)
 		return;
 	if(!wintoclient(ev->window))
+        errores = fopen("/tmp/errores.txt", "a+");
+        fprintf(errores, "XID;\t%lu\n", ev->window);
+        fclose(errores);
 		manage(ev->window, &wa);
 }