код перевірки картки(A code that credit card companies use to authorize credit card charges. For example, American Express uses a four-digit number on the front of the credit card, and Visa, MasterCard, and Discover use a three-digit number on the back)
Порадник із перевірки Windows XP(A program that determines whether the Windows product key installed on a computer matches the original Windows product key that was purchased and provides customized recommendations for resolution when an installation of Windows has failed validation)