The multi site documentation is not very clear about how to set up additional sites and where the code is stored. You can find the multi-site code and documentation at www.salesforce.com/code/products/multi-site.
The example sentences provided are all sub-domains. For people starting out, it should have more examples and reasons.
I.e. if you have a specific brand store running alongside your main site but using the same inventory how would this be setup?
I raise this as the only partially consistent information out there at the moment relates specifically to hosting providers and each one has a different approach to the same task.
