For how long do I need to register a .cat domain name ?
The minimum is for 1 year and the maximum 10 years.
What "contacts" are needed to register my domain name and how do they work?
There are 4 types of contacts - billing, registrant, auxiliary billing, and technical. The billing information is used to identify whose enom.cc account the domain name belongs to. The auxiliary billing information is used to identify the actual user who purchased the domain. Note: The auxiliary billing information is usually only useful with a reseller account.