how to avoid some pages from being indexed by search engines?

Question

There is rel="nofollow" but I am not sure about this if it prevents indexing. What do you say? Any ideas

Respect

UPDATE

Sorry I wasn't very clear. There a page a.php, and it has links b.php, c.php, d.php and some other text content. The link to b.php is only relevant if the users are on a.php, and doesn't really returns any output. Its not relevant if somebody goes directly on this b.php from yahoo/google search results.

Answer 1

You can update the robots.txt file specifying which URLS not to index or make sure that they are not in your sitemap.xml file

http://www.robotstxt.org/

Answer 2

<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">