code: def fill_window(self, seqNum):
          
          if _debug: SSM._debug("fill_window %r", seqNum)
          if _debug: SSM._debug("    - actualWindowSize: %r", self.actualWindowSize)
  
          for ix in range(self.actualWindowSize):
              apdu = self.get_segment(seqNum + ix)
  
              # send the message
              self.ssmSAP.request(apdu)
  
              # check for no more follows
              if not apdu.apduMor:
                  self.sentAllSegments = True
                  break
docs: This function sends all of the packets necessary to fill
          out the segmentation window.