An oil filter has a drain hole, which is internally blocked with a valve member. The computer system traverses at least one link in each set record that identifies at least one task record assigned to the respective set. An automated system provides a means for customers to manage lines of credit, setup transfer transactions, define rules governing transfers and view transactional history. During collaboration, the security restrictions are enforced. a proximity verifier receives authentication data of a first party wishing to give away or redistribute a content item.