In GWTP, what are the difference of onBind, prepareFromRequest, revealInParent, onReveal, onReset in Context of Present-ChildPresenter? Very Confused

I am using GWTP, I am also using NestedPresenter in a form of parentPresenter (Ex: HeaderPage) and childPresenter (ContentPage). I also want to send info from parentPresenter to childPresenter (Ex: when user Loginned in HeaderPresenter then the info will be pass onto the childPresenter).

Now, I am very confusing about the difference among onBind, prepareFromRequest, revealInParent, onReveal, onReset.

Google said (https://code.google.com/p/gwt-platform/wiki/FrequentlyAskedQuestions#How_do_I_choose_between_onReveal()_and_onReset()?) "On First Load, onBind will be called first then prepareFromRequest will be called sencond, revealInParent called 3rd, then onReveal, then onReset".

So here are the list of my questions:

-When a page that have Header & Content, then cycle (onBind, prepareFromRequest, revealInParent, onReveal, onReset) will be called first in parent header presenter, then after that all same cycle (onBind, prepareFromRequest, revealInParent, onReveal, onReset) will be called second in child or nested content presenter?

Or both parentPresenter & childPresenter go through the cycle independently?

If they go through the cycle independently, then we can have a problem. Ex, whenever user refreshes the page (header+content), if the header already checked the session, then I want the header pass the session info into the child content page, but since they go through the cycle independently then how parent presenter pass info when child presenter has not initialized?

Second question is how to know which method should to be put put into which cycle?

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