One question: If they are using 80386 memory segments, how do they cope with systems like AMD64 and the linux kernel both of which have flat memory systems? Bes

One question: If they are using 80386 memory segments, how do they cope with systems like AMD64 and the linux kernel both of which have flat memory systems? Besides, normal desktop OSes already isolate programs in their own memory segments. Its the device access permissions and systems syscall accesses that cause all the problem with secure object code usage.