I've looked into this a little further. The .htaccess doesn't work, and my guess is that the apache installation doesn't have AllowOverride All.

However, it seems that I can set the include path on a per file bases using PHP's set_include_path()

<?
set_include_path(get_include_path() . ":" . $s9y ...

From the wiki doc, I can see that serendipity supports a shared installation. However it seems to me that you need access to the apache configuration. (Or am I wrong?)

I don't have subdomains, and I have only ftp access to my webserver. Basically, I just want two weblogs for two different users. We ...