Robot.txt file is very usable file in indexing pages in different search engines... You can block the Search Engine's robot from indexing it. for more information just find this on Google Help. I will help you
A Search Engine will index everything unless told not to. The robots.txt file is the instruction that tell the SEs what not to index.
http://www.google.com/support/webmasters/bin/answer.py?answer=40362 If you want to know about robot.txt file... just log on the above cited url. watch this section.... this page will be help you.... ---------------------------------------------------------- Swimming Pool Installer | Fashion Accessories | Garment Rails