title: Is there a way to use installations to prevent users from creating multiple accounts from one device?
body: <p>I have a Parse app that requires users to create accounts. For the sake of user integrity, I do not want them to be able to create more than one account. I understand that people will always find a way around the system, but is it possible to somehow check if an account is already associated with the user's device when they are signing up?</p>
  
  <pre><code>func checkDevice {
        if /*Installation already exists*/ {
              displayAlert("Could not sign up. Please contact support.")
        } else {
              signUp()
        }
  }
  </code></pre>