Activating an application or a site When distributing an application or a site, you may want to offer both a full version and a limited version... Activation key functions The following functions are used to manage activation keys: KeyCalcActivationKey (Function) Calculates the activation key of application from the initial key. KeyCompareKey (Function) Compares an initial key with an activation key. KeyGenerateInitialKey (Function) Generates the initial key (unique license number) for the activation system of the application. KeyGetIdentifier (Function) Retrieves the identifier that was used to generate an initial key.