title: How to save the page object for later use?
body: <p>My puppeteer is going to have multiple user access it, but after they did or before they start I want to track which page they opened if they want to do more action or not. Close the page in 30 min after if any action not perform.</p>
  
  <p>Is there any page ID or something I can use, I saw there's <code>browser.pages</code> to get the index, but don't know how to utilize this function.</p>
  
  <p>my application is a REST server where a user will post a request and puppeteer will do some task.</p>