Authentication ==> 500 Internal Error

[Anon]

I'm using PHP Authentication with:
if(!($PHP_AUTH_USER)):
...
This works fine on my hosted server (Linux) but not on my local development machine (NT). When this bit of code executes, I get the above error.
My local machine has the following config:
NT4 SP4
PHP Version 4.0RC1
Apache/1.3.11

I've read that php authentication needs PHP installed as a module to make this work. Is this correct? Any suggestions as to how I get it to work locally would be appreciated?

Thanks
Mark

[Anon]

go to www.php4win.de, there you can find a php distribution for windows, that comes with a apache modul. basic authentication sould work then.