diff --git a/src/main.c b/src/main.c
index af11691..6072b83 100644
--- a/src/main.c
+++ b/src/main.c
@@ -49,6 +49,7 @@
 #endif
 
 #include <X11/Xlib.h>
+#include <X11/Xatom.h>
 
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
@@ -221,6 +222,16 @@ xfdesktop_handle_quit_signals(gint sig,
 int
 main(int argc, char **argv)
 {
+    /******************************************************************/
+
+    Display          *_dpy;
+    Atom             *_atoms;
+    gchar           **_atom_names;
+    guint             _atom_count;
+    guint             _i, _c;
+
+    /******************************************************************/
+
     GOptionContext *octx;
     GdkDisplay *gdpy;
     GtkWidget **desktops;
@@ -328,6 +339,36 @@ main(int argc, char **argv)
     
     g_print("%s[%d]: starting up\n", PACKAGE, getpid());
 
+    /******************************************************************/
+
+    _dpy = XOpenDisplay (NULL);
+    _atom_count = XScreenCount (_dpy);
+    _atoms = g_new (Atom, _atom_count);
+    _atom_names = g_new0 (gchar *, _atom_count + 1);
+
+    for (_i = 0; _i < _atom_count; _i++)
+        _atom_names[_i] = g_strdup_printf ("WM_S%d", _i);
+
+    if (!XInternAtoms (_dpy, _atom_names, _atom_count, False, _atoms))
+        _atom_count = 0;
+
+    for (_c = 0; _c < 3; _c++)
+    {
+        for (_i = 0; _i < _atom_count; _i++)
+        {
+            if (XGetSelectionOwner (_dpy, _atoms[_i]) == None)
+                g_print("%s[%d]: [round %d] window manager NOT ready on screen %d\n", PACKAGE, getpid(), _c, _i);
+            else
+                g_print("%s[%d]: [round %d] window manager ready on screen %d\n", PACKAGE, getpid(), _c, _i);
+        }
+        sleep (1);
+    }
+
+    g_strfreev (_atom_names);
+    g_free (_atoms);
+
+    /******************************************************************/
+
     sm_client = xfce_sm_client_get();
     xfce_sm_client_set_restart_style(sm_client, XFCE_SM_CLIENT_RESTART_IMMEDIATELY);
     xfce_sm_client_set_priority(sm_client, XFCE_SM_CLIENT_PRIORITY_DESKTOP);