'robot.txt' file to be indexed by SEs?!

are there any tricky uses of robot.txt file?

[yuvika]

One of my frnd suggested me to upload robot.txt file in the root directory, in order to be indexed by SEs. But as far as i know n my search on 'google' and 'webmasterworld' is concerned, robot.txt file is used to prevent SE spiders to index perticular webpages.

So are there any tricky ways to use robot.txt file?

I was also suggested to create navigation for my site using front page. How do i create site navigation for my already existed website, which has been created using another tool?

Any veteran SEO master can suggest effective solution.

[AjiNIMC]

One of my frnd suggested me

Do not take his advice here :). This is a mutual help for webmasters and search engines. A RFC.