So at any point, the site knows that next request from your browser (identified by the cookies) should also contain this other id. Each new page you visit might contain a new id. So a form on a page might contain the id 1234, and any links will also contain that id. Secondly, it can also add another, different id (call it the page id), to any link or form you submit on the site. So, in this case, both your original tab and your new tab will send the same cookie. That way the server can identify any request coming from you, is really from you. This is managed using cookies whenever you visit a page on the site, your browser will send a cookie which normally contains some kind of id. Firstly, you are logged in to the site and have a session on there. One way to do this is via cookies and ids.
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