Let's assume there's an HTML page hosted on
http://programmer-domain.example/iframe.html, containing text "SDFHIASDFASDFKSDAF".
Let's assume there's also another page,
http://customer-domain.example/index.html, that includes this first page via an iframe tag.
As it's known, Google indexing engine indexes the iframes in a way if you google for "SDFHIASDFASDFKSDAF", both pages will be shown in results.
How can this be achieved that only the page in
customer-domain.example is indexed, but not the
programmer-domain.example one? I guess using noindex in HTML tags of
iframe.html, or Disallow-ing in
programmer-domain.example will result in no pages being indexed.