Querying different web pages at once

Querying different web pages at once

Hello!! First of all, congratulations for everything!

Well, I would like to ask one brief question. I have a script that collects, by JQuery selectors, specific information from one web page, and it accomplishes its purpose. But the problem is that I would like to get the same specific information (using exactly the same script) but from a list of web pages, and not only one web page. The information got by the first only-applied-to-one-web-page script returns the specific information by the Javascript's console. It's so annoying to be copying and pasting the specific information from each of all the web pages of the list.
My question is: how could I get all this information from only one script? I have tried it by opening a different window and dumping each request to the window, but I couldn't achieve it (the script opens the window, but when I want to have access from the main script to the secondary window, some actions are allowed and some other, allmost all, are not).
I would be so pleased if someone could show me an example of how could someone get some specific information from 2 different web pages by applying the same JQuery selectors in one unique output.
Thank you a lot.