switch (AccessLevel)
   {
   case (7)            // for guests
      {
      if ((Domain.equals ("Science")) & (!UseAnalyzer))
         {
         forward ();   // Go to scientific instance
         upper();
         break;
         }
      else     // Go to instance in default domain 			
         {
         reload();
         if (Screen != null)
         break;
         next ();     // Go to next available page
         upper();
         break;
         }
      }
   }