You can receive:
CategoryService CategoryService( )
void countLinksForCategory( mixed $categoryid)
void getAllItemsForCategory( mixed $categoryid)
Object getCategory( int $id)
Object getCategoryAdminService( )
void getCategoryEnumeration( )
void getCategoryList( )
void getCategorysForItem( mixed $itemtype_id, mixed $item_id)
void getItemsForCategory( mixed $itemtype_id, mixed $categoryid)
void getTopLevel( )
void isItemLinkedToCategory( mixed $itemtype_id, mixed $item_id, mixed $category_id)