code: def stalk_buffer(self, pid, address, size, action = None):
          
          self.__set_buffer_watch(pid, address, size, action, True)
docs: Sets a one-shot page breakpoint and notifies
          when the given buffer is accessed.
  
          @see: L{dont_watch_variable}
  
          @type  pid: int
          @param pid: Process global ID.
  
          @type  address: int
          @param address: Memory address of buffer to watch.
  
          @type  size: int
          @param size: Size in bytes of buffer to watch.
  
          @type  action: function
          @param action: (Optional) Action callback function.
  
              See L{define_page_breakpoint} for more details.
  
          @rtype:  L{BufferWatch}
          @return: Buffer watch identifier.