The Technical Contact is the person or organization that maintains the domain name Registrant's primary name server and resolves software, and database files. The Technical Contact keeps the name server running and interacts with technical people in other domains to solve problems that affect the domain name. An Internet Service Provider often performs this role. If the Technical or Billing Contact information is missing from the Registration Agreement, it is presumed that the domain name Registrant has authorized the Administrative Contact/Agent to act as the Technical Contact.
Note:
In many cases, a single person will be the registrant and sole contact for a domain name.
First of all domain name must be available which can be verified with domain name verification page. Type in domain name you'd like to register not including "http://" or "www." in front of it and excluding domain name extension (read below). If wanted domain name is available, you'll be prompted to register it.
The second rule is the rule of valid characters.
Can I register a name that seems to be expired and not used?
No. If the name shows up in the Whois Database, then the name is still registered. Like any utility company, if you don't pay your bill on time, they do not simply cut your service off, they give you time to send a payment to them.
That is the same thing that happens with a domain name, just because the date for the domain name to expire has past, doesn't mean that the domain name will become available the next day. You can keep checking the domain name in the whois database, and when it disappears, then the domain will be available for you to purchase or you can try out back order domain name service that will monitor the domain name day and night for you and register it as soon as it becomes available.
For normal ASCII domain names, the letters a-z, the numbers 0-9, and one special character, the hypen or dash "-". Note that domains cannot start or end with a hyphen. For the new testbed IDNs (Internationalized Domain Names), the full range of Unicode characters are available. This allows nearly all of the languages on the planet to be represented within domain names, including Thai, Arabic, Lao, Hebrew, French, German etc.
No one can "OWN" a domain name any more than one can "OWN" a telephone number. However, when you register a domain name, the domain name cannot be taken by anyone else, and you are responsible for all aspects of the domain name.