JSF在长时间运行过程中保持会话活动

We have a long-running process in our JSF (MyFaces implementation) WebApp. It is required to have an active session during this long-running process. Will bringing focus on various components every so often keep the session alive? (ie, clicking the background, mouse-over tabs/links, etc). I have had success with this and don't understand why this is working. Is this due to some sort of javascript/ajax functionality in the underlying implementation? Thanks.We have a long-running process in our JSF (MyFa