[imp] Using IMP in a sub domain

[Nicolas [HiTech Planet]]

> Make sure that you set the correct aliases and the correct value for
> SetCanonicalName.
> This is all covered in the FAQ and the mailing list archive.

I'm sorry but I can't find anything about 'SetCanonicalName' anywere. Even
on Google, the search return One result (and its not understandable). Is
that an Apache issue? I have no access to the configuration of Apache, since
i'm not on a dedicated server. Anyway, it has already worked 2 days ago...