diff --git a/reactos/services/winlogon/winlogon.c b/reactos/services/winlogon/winlogon.c
index 4d556fd2551..03a0995b2da 100644
--- a/reactos/services/winlogon/winlogon.c
+++ b/reactos/services/winlogon/winlogon.c
@@ -10,19 +10,169 @@
 
 /* INCLUDES *****************************************************************/
 
-//#include <ddk/ntddk.h>
-#include <stdio.h>
+#include <ddk/ntddk.h>
+//#include <stdio.h>
+
+/* GLOBALS ******************************************************************/
+
+HANDLE	SM		= INVALID_HANDLE_VALUE;	/* SM API LPC port */
+HANDLE	SasEvent	= INVALID_HANDLE_VALUE;	/* int 0x19 */
+
 
 /* FUNCTIONS *****************************************************************/
 
-int main()
+
+/***********************************************************************
+ *	SmTerminationRequestHandler
+ */
+VOID
+STDCALL
+SmTerminationRequestHandler (VOID)
 {
-   char username[255];
-   char password[255];
-   
-   printf("Winlogon\n");
-   printf("login: ");
-   fgets(username, 255, stdin);
-   printf("Password: ");
-   fgets(password, 255, stdin);
+	/* Should winlogon perform any action
+	 * before committing suicide?
+	 */
+	NtTerminateProcess(
+		NtCurrentProcess(),
+		0
+		);
 }
+
+
+/***********************************************************************
+ * 	HasSystemGui
+ * 	
+ * DESCRIPTION
+ * 	Call the Session Manager to know if user I/O is via a GUI or
+ * 	via a CUI.
+ *
+ * RETURN VALUE
+ * 	TRUE	GUI active
+ * 	FALSE	CUI only
+ */
+BOOL
+HasSystemGui (VOID)
+{
+	/* FIXME: call smss.exe to know, since it
+	 * controls environment subsystem servers
+	 * waking up. ReactOS has only text mode
+	 * now, therefore we can answer (EA.19990608).
+	 */
+	return FALSE; /* NO GUI */
+}
+
+
+/***********************************************************************
+ *	HasSystemActiveSession
+ * 	
+ * DESCRIPTION
+ * 	Call the Session Manager to know if there is already an active
+ * 	session.
+ *
+ * RETURN VALUE
+ * 	TRUE	a session is active
+ * 	FALSE	no sessions
+ */
+BOOL
+HasSystemActiveSession (VOID)
+{
+	/* FIXME: call smss.exe to know */
+	return FALSE; /* NO SESSIONS */
+}
+
+
+/***********************************************************************
+ * 	GuiLogin
+ * 	
+ * DESCRIPTION
+ * 	Graphical login procedure
+ */
+VOID
+GuiLogin (VOID)
+{
+	/* FIXME: Open logon dialog */
+}
+
+
+/***********************************************************************
+ * 	CuiLogin
+ * 	
+ * DESCRIPTION
+ * 	Text mode (console) login procedure
+ */
+VOID
+CuiLogin (VOID)
+{
+	char username[255];
+	char password[255];
+
+	/* FIXME: to be used ntdll.dll only? */
+	printf("Winlogon\n");
+	printf("login: ");
+	fgets(username, 255, stdin);
+	printf("Password: ");
+	fgets(password, 255, stdin);
+}
+
+
+/* Native process entry point */
+void
+NtProcessStartup( PSTARTUP_ARGUMENT StartupArgument )
+{
+	NTSTATUS	Status = STATUS_SUCCESS;
+
+	/* FIXME: connnect to the Session Manager
+	 * for LPC calls
+	 */
+	Status = NtConnectPort(
+			"\\SmApiPort",
+			& SM
+			);
+	if (!NT_SUCCESS(Status))
+	{
+		NtTerminateProcess(
+			NtCurrentProcess(),
+			0 /* FIXME: return a proper value to SM */
+			);
+	}
+	/* FIXME: register a termination callback
+	 * for smss.exe
+	 */
+	/* ??? register SmTerminationRequestHandler */
+	/* FIXME: hook Ctrl+Alt+Del (int 0x19)
+	 * (SAS = Secure Attention Sequence)
+	 */
+	/* ??? SasEvent = ? */
+	while (TRUE)
+	{
+		/*
+		 * Make the main thread wait
+		 * for SAS indefinitely.
+		 */
+		NtWaitForSingleObject(
+			SasEvent
+			/* ... */
+			);
+		/*
+		 * If there is no local session, begin
+		 * the login procedure; otherwise print
+		 * display
+		 */
+		if (TRUE == HasSystemActiveSession())
+		{
+			continue;
+		}
+		/* LOGON */
+		if (TRUE == HasSystemGui())
+		{
+			/* GUI active, login in graphical mode */
+			GuiLogin();
+			continue;
+		}
+		/* No GUI, login in console mode */
+		CuiLogin();
+	}
+}
+
+
+/* EOF */