It looks like NetRegistry only has Zeus and IIS hosting accounts.
So any apache thingeys like mod_rewrite wont work.
(Zeus has it’s own mod_rewrite sorta thing, which may or may not be compatible with your php scripts)
Also you will need to set you own custom PHP temporary session directory to get PHP sessions working correctly. ie: the default /tmp/ or whatever doesn’t work, so session data wont save anywhere.