How do you register 2 letter domains?

[johnnyboy]

I've noticed on the odd occasion people selling 2 letter/number domains. However, when I type in a domain with 2 characters into a domain registrar, an error message appears, saying that it's invalid. How are people registering them?

 

[foz]

Been discussed before,

http://www.acorndomains.co.uk/domain-research/38475-reserved-lls.html

http://www.acorndomains.co.uk/nominet-general-information/56094-cannot-register-ll-co-uk.html

 

[johnnyboy]

Thanks for the link foz.