Source code of the WordPress function get_term_custom.
Source code
add_post_type support: Source code
By the Web Warlock, Wednesday, 28/Jul/2010 3:36
Source code of the function add_post_type_support, located in the file wp-includes/post.php
register_post_type: Source code
By the Web Warlock, Wednesday, 23/Jun/2010 20:09
Source code of the WordPress function register_post_type.