Sorry for the vague title. Let me elaborate. I do not know the keywords for this so I couldn't Google this. Imagine mydomain.com is a platform where people could come in and generate their contents. They could create their own pages and each of their page is to be mapped to xxx.mydomain.com. so suppose there is a user named "John Doe" and his ID is 222, you can access his page viaby Nines - How to...