An easy way to add custom fields to your object types (post, pages, custom post types, users)
After adding the call below to an action_menu hook it just worked:
x_add_metadata_field( 'my_new_id', 'user', array('label' => 'my_new_id', 'display_column' => true) );
An admin could then set and maintain the new field in the normal way (select [Users -> All Users] ...).
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