What does this really amount to? site:www.mydomain.com

[contentmaster]

I wanted to know the common take on site:www.mydomain.com when searched on google.

What is the real relevance of such a search? Does it display the number of pages of your site in google's index? Also is this a perfect calculation of the number of pages on your site?

What about link:www.mydomain.com ...why does this show only 3 results when I know many more sites link to me?

[mona]

Also is this a perfect calculation of the number of pages on your site?

No, it's not. Lately it seems to be way off at times, not really sure why. The link function hasn't been accurate for a year or two. Try using Yahoo instead -
link:http:// www.blahblah.com