QUESTION A page as a host for information about other pages

[lotova]

I want to select some created pages according to their creation date and values of some other fields and insert their title and creation date (and maybe some other meta information) with links to every respective page in another page. I want that content of the destination page is provided automatically, that is if a page is created that meets criteria its title etc. appears in the destination page and when the criteria cease to be valid (a time elapses) it disappears from it (shortly, I want imitate official notice board).
I know that information about all pages is stored in $pagesArray array so I can obtain information from there and write some function that selects desired pages. But there are two things that I don't know: where should I place such function and how I insert the result of that function in the destination page?