You want a small login form to appear somewhere on your website, but the DataPage behind it to be on a separate page. Once a user logs in, they should be redirected into the real DataPage.
Take the steps below to create this behavior:
1. Create an HTML DataPage and restrict access to the DataPage via authentication.
2. In the Authentication Advanced Settings, you can change Login redirection on success.
3. Deploy this HTML DataPage where you want the login form to appear.