diff --git a/wdmtg.vala b/wdmtg.vala
index 30b2ddc..534d76e 100644
--- a/wdmtg.vala
+++ b/wdmtg.vala
@@ -49,6 +49,15 @@ namespace Wdmtg {
 
   string? current_title;                ///< Current window title
   X.Window current_window;              ///< Current window
+  bool current_idle = false;            ///< Current idle status
+
+  struct Event {
+    public int64 timestamp;             ///< When the event happened
+    public string? title;               ///< Current title at the time
+    public bool idle;                   ///< Whether the user is idle
+  }
+
+  AsyncQueue<Event?> queue;             ///< Async queue
 
 // --- X helpers ---------------------------------------------------------------
 
@@ -119,6 +128,14 @@ namespace Wdmtg {
     return changed;
   }
 
+  void push_event () {
+    queue.push(Event () {
+      timestamp = get_real_time (),
+      title = current_title,
+      idle = current_idle
+    });
+  }
+
   void update_current_window () {
     var root = dpy.default_root_window ();
     X.Atom dummy_type; int dummy_format; ulong nitems, dummy_bytes;
@@ -139,9 +156,11 @@ namespace Wdmtg {
       new_title = x_window_title (active_window);
       current_window = active_window;
     }
-    if (update_window_title (new_title))
+    if (update_window_title (new_title)) {
       stdout.printf ("Window changed: %s\n",
         null != current_title ? current_title : "(none)");
+      push_event ();
+    }
   }
 
   void on_x_property_notify (X.PropertyEvent *xproperty) {
@@ -150,8 +169,10 @@ namespace Wdmtg {
       update_current_window ();
     else if (xproperty.window == current_window
       && xproperty.atom == net_wm_name) {
-      if (update_window_title (x_window_title (current_window)))
+      if (update_window_title (x_window_title (current_window))) {
         stdout.printf ("Title changed: %s\n", current_title);
+        push_event ();
+      }
     }
   }
 
@@ -174,6 +195,8 @@ namespace Wdmtg {
   void on_x_alarm_notify (X.Sync.AlarmNotifyEvent *xalarm) {
     if (xalarm.alarm == idle_alarm_inactive) {
       stdout.printf ("User is inactive\n");
+      current_idle = true;
+      push_event ();
 
       X.Sync.Value one, minus_one;
       X.Sync.int_to_value (out one, 1);
@@ -187,6 +210,9 @@ namespace Wdmtg {
         X.Sync.TestType.NegativeComparison, minus_one);
     } else if (xalarm.alarm == idle_alarm_inactive) {
       stdout.printf ("User is active\n");
+      current_idle = false;
+      push_event ();
+
       set_idle_alarm (ref idle_alarm_inactive,
         X.Sync.TestType.PositiveComparison, idle_timeout);
     }
@@ -219,6 +245,8 @@ namespace Wdmtg {
       return 0;
     }
 
+    queue = new AsyncQueue<Event?> ();
+
     X.init_threads ();
     if (null == (dpy = new X.Display ()))
       exit_fatal ("cannot open display");