Php domain re-direct question

I have question about how to get a specific domain name to point to a specific file. Here’s my issue, I have one main domain ( and I have three other promotional type domains that need to point to specific files ([URL=“”]

So like, pointing to [URL=“”]

Is this possible using php? It’s an IIS server and I don’t have access to the admin panel so .htaccess type redirects aren’t possible, any ideas?