diff --git a/xvaga/xvaga.cpp b/xvaga/xvaga.cpp
index 8569fd830..edb85ea22 100755
--- a/xvaga/xvaga.cpp
+++ b/xvaga/xvaga.cpp
@@ -6,6 +6,7 @@
 #include "wx/fileconf.h"
 #include "wx/fontdlg.h"
 #include "wx/image.h"
+#include <wx/snglinst.h>
 
 #include "wx/fs_zip.h" 
 #include "wx/html/helpctrl.h"
@@ -3487,12 +3488,15 @@ BOOLEAN xvt_sys_goto_url(const char* url, const char* action)
 
 BOOLEAN xvt_sys_dongle_server_is_running()
 {
+  wxSingleInstanceChecker sic("Authorization");
+  BOOLEAN ok = sic.IsAnotherRunning();
+
 #ifdef WIN32
-  ATOM a = GlobalFindAtom("DONGLE_SERVER_ATOM");
-  return a != 0;
+  if (!ok) // Testo anche Frontend!
+    ok = ::GlobalFindAtom("DONGLE_SERVER_ATOM") != 0;
 #endif
 
-  return FALSE;
+  return ok;
 }
 
 int xvt_sys_get_profile_string(const char* file, const char* paragraph, const char* name,