How to do this simple php trick with araneida?

I'd like to do a simple login form that protects an entire directory of files.
When the login is correct, redirect to the home page under that directory.
When it is not, redirect back to the login page.

Simple, right?  Well, in php it is.  But in araneida it seems I have to set up
a special handler, check for the file being asked for, and react accordingly.
And I still can't seem to get the hang of the redirecting compared to php.

Are there any docs or examples on how to do this?

Jonathon McKitrick
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My other computer is your Windows box.