timerEvent(eventTag: Integer) updating;
The timerEvent method of the WebSession class, which you can reimplement in your user Web session subclasses, is called when the session times out.
Use the eventTag parameter to specify the WebSession class WebSession_System_Timer_Event constant; for example, your methods could contain your application‑specific processing code and then the following.
inheritMethod(WebSession_System_Timer_Event);
For Web session timeouts to work, you must call the