diff --git a/Makefile b/Makefile
index 5517fc1..70e0592 100755
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 
 TARGET   := pppc.exe
-OBJS     := pppc.o
+OBJS     := pppc.o session_notification.o
 CXXFLAGS := -O2 -Wall
 
 all: $(TARGET)
diff --git a/session_notification.cc b/session_notification.cc
new file mode 100644
index 0000000..1229899
--- /dev/null
+++ b/session_notification.cc
@@ -0,0 +1,70 @@
+
+#include <windows.h>
+#include <stdlib.h>
+#include <iostream>
+#include "session_notification.h"
+using namespace std;
+
+static BOOL WINAPI (*WTSRegisterSessionNotification)(HWND, DWORD) = NULL;
+static BOOL WINAPI (*WTSUnRegisterSessionNotification)(HWND) = NULL;
+static HMODULE wtsapi = NULL;
+
+void session_notification_enable(HWND hWnd)
+{
+    if (wtsapi == NULL)
+    {
+        wtsapi = LoadLibrary("wtsapi32.dll");
+        if (wtsapi == NULL)
+        {
+            cerr << "Could not load wtsapi32.dll!" << endl;
+            exit(2);
+        }
+    }
+    if (WTSRegisterSessionNotification == NULL)
+    {
+        WTSRegisterSessionNotification = (BOOL WINAPI (*)(HWND, DWORD))
+                GetProcAddress(wtsapi, "WTSRegisterSessionNotification");
+        if (WTSRegisterSessionNotification == NULL)
+        {
+            cerr << "Could not obtain WTSRegisterSessionNotification address!"
+                 << endl;
+            exit(3);
+        }
+    }
+
+    if (WTSRegisterSessionNotification(hWnd, NOTIFY_FOR_ALL_SESSIONS)
+            != TRUE)
+    {
+        cerr << "WTSRegisterSessionNotification() error: "
+             << GetLastError() << endl;
+    }
+}
+
+void session_notification_disable(HWND hWnd)
+{
+    if (wtsapi == NULL)
+    {
+        wtsapi = LoadLibrary("wtsapi32.dll");
+        if (wtsapi == NULL)
+        {
+            cerr << "Could not load wtsapi32.dll!" << endl;
+            exit(2);
+        }
+    }
+    if (WTSUnRegisterSessionNotification == NULL)
+    {
+        WTSUnRegisterSessionNotification = (BOOL WINAPI (*)(HWND))
+                GetProcAddress(wtsapi, "WTSUnRegisterSessionNotification");
+        if (WTSUnRegisterSessionNotification == NULL)
+        {
+            cerr << "Could not obtain WTSUnRegisterSessionNotification address!"
+                 << endl;
+            exit(3);
+        }
+    }
+    if (WTSUnRegisterSessionNotification(hWnd) != TRUE)
+    {
+        cerr << "WTSUnRegisterSessionNotification() error: "
+             << GetLastError() << endl;
+    }
+}
diff --git a/session_notification.h b/session_notification.h
new file mode 100644
index 0000000..4c181af
--- /dev/null
+++ b/session_notification.h
@@ -0,0 +1,20 @@
+
+#include <windows.h>
+
+#define NOTIFY_FOR_THIS_SESSION     0
+#define NOTIFY_FOR_ALL_SESSIONS     1
+
+#define WM_WTSSESSION_CHANGE        0x02B1
+
+#define WTS_CONSOLE_CONNECT         0x1
+#define WTS_CONSOLE_DISCONNECT      0x2
+#define WTS_REMOTE_CONNECT          0x3
+#define WTS_REMOTE_DISCONNECT       0x4
+#define WTS_SESSION_LOGON           0x5
+#define WTS_SESSION_LOGOFF          0x6
+#define WTS_SESSION_LOCK            0x7
+#define WTS_SESSION_UNLOCK          0x8
+#define WTS_SESSION_REMOTE_CONTROL  0x9
+
+void session_notification_enable(HWND hWnd);
+void session_notification_disable(HWND hWnd);