Questions[subdomain](server)

I am trying to create url like sub2.sub1.subdomain.domain.com. I am planning to use this to display different content.

my questions are...

1) Is it possible to create such multi level sub domains? - is this based on the hosting company?
2) Isn't sub2.sub1.subdomain a different subdomain rather than a sub domain of sub1?
3) Will all of these subdomains have their own doc roots?
4) How will I handle users coming with and without www.

Any other potential issues that might arise?

EDIT:- How does this affect the behaviour of cookies? Can I access a cookie set on subdomain.domain.com on sub1.subdomain.domain.com or sub2.sub1.subdomain.domain.com

I'm making a website, and I need a sub-domain.

I need to add the new part to my website, but I don't know which type of DNS record to add in the DNS console to point to this new site.

Is it A or CNAME?

I've just installed Nginx on my server and am extremely happy with the results, however I still cannot figure out how to insert wildcard virtual hosts.

This is the [directory] structure I'd like:

-- public_html (example.com)
---subdoamin 1 (x.example.com)
---subdomain 2 (y.example.com)

As you can see it's pretty basic, however, I'd like the ability to add domains by simply adding an A record for a new subdomain, which will instantly point to the subdirectory of the same name under public_html.

There's stuff on the web, however I haven't come across something exactly like this.

Any help would be greatly appreciated.

I have some subdomains I want to redirect to specific ports on the same server. Say I have

dev.mydomain.com 

I want dev.mydomain.com to transparently redirect to mydomain.com:8080 and I want to preserve the original sub-domain name the url of the browser.

How do I do this with Apache 2.2? I have Apache 2.2 running on default port 80. I can't figure out the write configuration to get this to happen.

I have already set up dev.mydomain.com to resolve in DNS to mydomain.com.

This is for an intranet development server that has a non-routable ip address so I am not so concerned about exploits and security that would compromise a publicly facing server.

I'd like to know if any certificates support a double wildcard like *.*.example.com? I've just been on the phone with my current SSL provider (register.com) and the girl there said they don't offer anything like that and that she didn't think it was possible anyway.

Can anyone tell me if this is possible, and if browsers support this?