[O] collect info from org files in agenda when open?

[Gregor Zattler]

Dear org-mod users and developers,

I customized my org-agenda-files variable to contain 4 files.
But I wished I could automatically add org files to the agenda
simply by opening them.  Is it possible to automagically add
some files to the agenda iff they are visited or add the contents
of org-mode buffers?

Ciao, Gregor
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