You really missed the mark there, Donatello, that wasn't the OP's question.
To the OP, if you only wish for search engines to index the one like site.com/home then you must be sure that that is the only link available to that page on your site.
For instance, if you go out and litter blog posts, forums, and other places on the web with site.com/?page=home, then google will see that link, follow it and index the content. If you instead make sure that anybody linking to you uses site.com/home, then that's the only one google will see.
Google will never index the text files if there are no direct links to them. This will hopefully provide you a clue that google's search engine only has results that have links to them. If I put a site up online and turned it into an island, without any incoming or outgoing links then, from my understanding of it, google would never index it because it would never know about it.
Hope that answer is sufficient.