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I think he means to have several URLs/domains pointing at the same site. Depending on the URL it would show with a specific theme.
If that is right, with a tricky hack it can be done. I did this once last year. First thing is to make the server show the same site under multiple hosts/domains. Under Apache that is ServerAlais or under a hosted server it can be Parked Domains and maybe a few other ways.
Then you need a hack that responds to the URL and returns a unique mainfile.php and common.php. I don't have all the details anymore as it became too much work to maintain and I'm no longer doing it.
A slightly easier way but also a theme hack is to have the theme change based on group membership.
It can get messy with upgrades.
no max no bling. goes double for mik. triple for the insane aliases of said lunatics
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Not around here anymore. Way too many idiots, so sad.