The DOLF system is a UID internal system for tracking use of materials and invoicing costs to students. Whenever you use UID material in a course or project (or for your own projects), you must register the material and the amount of material used in the DOLF system. In projects or courses, the school often covers a certain amount of the costs, and anything beyond that is paid by the student themselves.
The DOLF computer is located in the workshop, by the yellow lathe machine. Use that computer to DOLF the material that you take, unless you have received other istruction, such as writing it down on a specified list.