diff --git a/xvaga/xvaga.cpp b/xvaga/xvaga.cpp
index 971489fd5..748130344 100755
--- a/xvaga/xvaga.cpp
+++ b/xvaga/xvaga.cpp
@@ -53,6 +53,7 @@ wxString  _startup_dir;
 wxString  _strDefaultStatbarText;
 wxString  _appl_name;
 wxString  _appl_version;
+BOOLEAN   _appl_already_running;
 wxLocale* _locale = NULL;
 
 static XVT_ERRMSG_HANDLER _error_handler = NULL;
@@ -3940,6 +3941,9 @@ long xvt_vobj_get_attr(WINDOW win, long data)
   case ATTR_APPL_VERSION_STRING:
     ret = (long)(const char*)_appl_version;
     break;
+  case ATTR_APPL_ALREADY_RUNNING:
+    ret = _appl_already_running;
+    break;
   case ATTR_DOCFRAME_WIDTH:
   case ATTR_FRAME_WIDTH:
     ret = xvt_vobj_get_metric(win, wxSYS_FRAMESIZE_X);
@@ -4218,6 +4222,7 @@ void xvt_vobj_set_attr(WINDOW win, long data, long value)
     }
     break;
   case ATTR_APPL_VERSION_STRING: _appl_version = (const char*)value; break;
+  case ATTR_APPL_ALREADY_RUNNING: _appl_already_running = value != 0; break;
   case ATTR_BACK_COLOR: SetArtistColor(win, wxAUI_DOCKART_BACKGROUND_COLOUR, value); break;
 	case ATTR_ERRMSG_HANDLER: _error_handler = (XVT_ERRMSG_HANDLER)value; break;
   case ATTR_EVENT_HOOK: SORRY_BOX(); break;   // TBI?: Native events hook!
diff --git a/xvaga/xvapp.cpp b/xvaga/xvapp.cpp
index 267d7d297..d4cb63386 100755
--- a/xvaga/xvapp.cpp
+++ b/xvaga/xvapp.cpp
@@ -41,6 +41,7 @@ bool TMainApp::OnInit()
   const wxFileName strWrk = argv[0];
   const wxString strApp = strWrk.GetName().Lower();
   m_sic = new wxSingleInstanceChecker(strApp);
+  xvt_vobj_set_attr(NULL_WIN, ATTR_APPL_ALREADY_RUNNING, m_sic->IsAnotherRunning());
 
   // Non eseguo direttamente xvt_main per dar modo al main event loop di partire
 	wxTimerEvent evt(TIMER_ID);
diff --git a/xvaga/xvt_defs.h b/xvaga/xvt_defs.h
index 5f0161cd6..68470d46c 100755
--- a/xvaga/xvt_defs.h
+++ b/xvaga/xvt_defs.h
@@ -5,7 +5,7 @@
  *  Agreement with XVT Software.
  *
  *	$RCSfile: xvt_defs.h,v $ 
- *  $Revision: 1.11 $
+ *  $Revision: 1.11.2.1 $
  *
  *  Purpose: Global XVT macro definitions.
  *
@@ -492,6 +492,7 @@
 #define ATTR_APP_CTL_FONT_RID           (ATTR_BASE + 719)
 #define ATTR_SPEECH_MODE                (ATTR_BASE + 720) /* Added by Guy */
 #define ATTR_APPL_VERSION_STRING        (ATTR_BASE + 721) /* Added by Guy */
+#define ATTR_APPL_ALREADY_RUNNING       (ATTR_BASE + 722) /* Added by Guy */
 
 /* Font attributes */
 #define ATTR_FONT_MAPPER                (ATTR_BASE + 800)
diff --git a/xvaga/xvtextra.cpp b/xvaga/xvtextra.cpp
index 095f19da6..f8d69b7d5 100755
--- a/xvaga/xvtextra.cpp
+++ b/xvaga/xvtextra.cpp
@@ -1,7 +1,8 @@
 #include "wxinc.h"
-#include <wx/print.h>
-#include <wx/tokenzr.h>
 #include <wx/filename.h>
+#include <wx/print.h>
+#include <wx/snglinst.h>
+#include <wx/tokenzr.h>
 
 #include "xvt.h"
 #include "xvtart.h"