docs: public synchronized void initialiseSendWindow(long sendWindow, long definedSendWindow)
      throws SIResourceException 
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(this, tc, "initialiseSendWindow", new Object[] {Long.valueOf(sendWindow), Long.valueOf(definedSendWindow)} );
       
      
      // Prior to V7 the sendWindow was not persisted unless it was modified due to a change in
      // reachability, otherwise it was stored as INFINITY (Long.MAX_VALUE). Therefore, if the
      // defined sendWindow was modified we could be in the situation where before a restart we
      // had 1000 messages indoubt, then shut the ME down, changes the defined sendWindow to 50
      // and restarted. At that point we'd set the sendWindow to 50 and suddenly we'd have 950
      // available messages again (not indoubt). We'd then be allowed to reallocate them elsewhere!
      
      // Luckily, the ability to modify the sendWindow wasn't correctly exposed prior to V7 (it's
      // now a custom property), so no-one could have modified it. So, we can interpret a value
      // of INFINITY as the original sendWindow value, which is 1000. And use that when we see it.
      if( sendWindow == RangeList.INFINITY )
      {
        this.definedSendWindow = definedSendWindow; 
        this.sendWindow = 1000; // Original default sendWindow
        
        // Now persist the 1000 to make it clearer
        persistSendWindow(this.sendWindow, null);
      }
      else
      {
        this.sendWindow = sendWindow;
        this.definedSendWindow = definedSendWindow;   
      }  
        
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "initialiseSendWindow");
    }