Shared hosts are a pain in the grass as they often disable all sorts of stuff. I was working on one site recently where the host doesn't even allow disk access - yes, you got that right, you couldn't move file uploads, delete files, write files etc. It made life very depressing as the back end coder..
I think the op needs to clarify exactly what they mean to be honest as it could be seen several ways.
My helpful sig is on vacation trying to loose some weight. It got a bit fat and caused a few problems but it will be back at some point!