Function: Ajax handler for hidden columns.

Function: Ajax handler for updating whether to display the welcome panel.

Function: Ajax handler for retrieving menu meta boxes.

Function: Ajax handler for internal linking.

Function: Ajax handler for replying to a comment.

Function: Ajax handler for editing a comment.

Function: Ajax handler for adding a menu item.

Function: Ajax handler for adding meta.

Function: Ajax handler for adding a user.

Function: Ajax handler for closed post boxes.