Nope, you'll never, ever need it. I had to do it in the late 80s when I had to store part of my linked list in Expanded Memory. Expanded Memory basically meant using the memory space between 640K and 1MB and paging in memory one page at a time for access. It was a lot of work, but it served the purpose I was accomplish at the time. The only other time since then I've had to bother with low-level linked lists are during coding interviews, where you as well as the person across from you know that there's no way in Hades you'd ever need the stuff they're testing you on to work at the company they're interviewing you for.