> We should think of a pointer as consisting of logically three elements (p,b,e): the legal region is defined by the base b and bounds (or extent) e, and the po

> We should think of a pointer as consisting of logically three elements (p,b,e): the legal region is defined by the base b and bounds (or extent) e, and the pointer itself is p. Everything old is new again. Look up how segmentation works on x86 in 32-bit mode (initially introduced as "protected mode" on 80286).