If I had to guess, from a quick poke about: You POST your uploaded doc to 'do.php', which renders into an html file and puts it on disk, which is served by Apa

If I had to guess, from a quick poke about: You POST your uploaded doc to 'do.php', which renders into an html file and puts it on disk, which is served by Apache. That's about as simple as you can get. Let the web server do what it does best (serve files).