Continuance of the struggle (trying to understand)

Hi all, After my escapades with the real basics and realizing my laptop wasn't logged on as Administrator, I now am trying to work out why this script works sometimes but not others. <html> <head> <title>PHP Test</title> </head> <body> <p>This is an HTML line <?php

      echo "<p>This is a PHP line</p>";
      phpinfo();

?> </body> </html> If I save this as phptest.php and open IE pointing it to localhost/phptest.php it works fine. Get both lines of text followed by the pages of gumpf about php. However if I paste this into a