PHP and search engines

Hi, A few questions/statements about indexing/search engines. Q0: Search engines will always see the final result (generated HTML) and never sees the PHP scripts behind it. True? Q1: I've heard that pages containing ? and/or & will *not* be indexed by search engines. E.g. http://www.mydomain.com/test/test.php?a=1&b=2& Is this true? Q2: I also heard that if you changed ? and & by / the pages will be indexed! E.g. http://www.mydomain.com/test/test.php/a=1/b=2/ Will this work? Q3: Anybody with some experience about generating meta tags? Thanks again! Simon.