Well, I think I didn't ask the right question above. But now I can neither modify nor delete the post (I couldn't find the link, new here). So, I am redesigning my question here.
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I am thinking to structure a site with each user having their own space, like rudy.domain.com, spike.domain.com, etc.
Now, if I have 900 users, with 900 subdomains, do I need to have the same files 900 times? Say the index.php inside each of the subfolders will have the same code, client side content of which will change depending on the login details.
Like can I have an index.php somewhere, and when each of the folders will load, the same index.php (and all other files) will be called. Users will still see they are in their own space, say in vinnie.domain.com/index.php but that index.php will be physically located elsewhere.
Is that possible, or I will have to upload the same index.php 900 times in each sub folders?
Thought this is something that needs expert's advice, so I'm here.
NB. If this question arises in someone's mind, in CP we can create subdomains thro' a script, that's not an issue.