Page vs Content Actions & setting page title in actions

I am trying to figure out some differences, and if anyone can help me
understand I would appreciate it.

Page actions vs. Content actions

It appears page actions only run on the requested page.
Content actions run on all content.

So, if page A has one page action (a1) and one content action (a2)
and, page B has one page action (a3) and one content action (a4)

Page B is included in page A, (and using the extended filesystem repo)
Page A is requested:

Actions a1, a2, a4 will be run. Probably in that order?

Why are page actions defined <page-action></page-action> and content actions
are defined as <content-action name=""/> it appears that the format is
required, but I could be wrong.

Lastly,

I am attempting to call Page.setTitle() from inside either a page or content
action, but nothing seems to happen, how can I set the page name from an
action?

-Andy




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