Normally I do site:example.com <title of the page> to see if the page is in supplemental or not. Is there any other easier way through which I can easily check this ?
Awesome..what does those arguements means though ? I would really like to know how to screen out google index info
Hey that works! I know Aaron walls SEO for Firefox had a supplemental thing on it which did a similar query, which no longer works how did you find that out?
Use copyscape(dot)com to see if your page has duplicate content. If your site has duplicate content it will be in supplemental index.
use this tool http://oy-oy.eu/google/supplemental/ . it's showing your supplemental pages on each datacenter