These are called API's. E.g.
get_option is not a WP code. It's just a
function name. The
source code of that function is located in /wp-includes/functions.php and
is not included into the CyberSEO distributive. Do you want me to provide it? Just let me know and I'll give you the download URL
As
kazymjir has said above, I sell CyberSEO only. If you need WP, you have to download it
separately.