Address tiling refers to the practice of creating a mathematical or algorithmic relationship between an LDT selector and the base, or virtual address in the descriptor.
By using address tiling, OS2 avoids the need to move memory blocks because of reallocation, and also makes it very fast to convert an LDT Selector:Offset to a flat, or Linear Address. The implementation is simply to allocate 64K of virtual address space to each selector, starting with selector '000F', at virtual address 64K, or '%10000'.
Note: Selector '0007' is used to map the LDT as read-only data.