Wait until two different users click a button and then go to a page : <p>Hi working on a website project where I want to wait until two separate users click a button and then have them both go to the same page. These users will be each in their own browser window.
I have searched the internet and went to research ajax but found that is not what I am looking for because I want the page to automatically detect when the other user in a different browser clicked the button, instead of having a user repeatedly click a button to see if another user has clicked there button such as with ajax. Please help thanks.</p>

<p><strong>Goal: Have a user be automatically redirected to another page once a <em>different</em> user clicks the same button in a different window</strong></p>

<blockquote>
  <p>Example:</p>
  
  <p>user 1 and user 2 are both on a website</p>
  
  <p>user 1 clicks on a button.  user 1 is now waiting on a waiting page
  until another person clicks on the button in a different browser
  window.</p>
  
  <p>user 2 now clicks on the button in their own browser window</p>
  
  <p>user 1 and user 2 now get automatically redirected to the same page.</p>
</blockquote>
