How Do i test My Cd key(s) for Arma 2

How do i test my arma 2 cd Key(s) i would like to test one where do i test them?

Moved thread to appropriate section, please post in the right place next time. And to answer your queston use this program http://www.mpgh.net/forum/624-dayz-m...er-v1-0-a.html

Ok sorry im new i just made an account thanks for the help