Hi,   
      
       Its been a long time since Java & .Net introduced safe address   
       types to the computing world.   
      
       My question is have we settled on what could be a proper representation   
       for safe pointers ?   
      
       Some Mainframes like the 390 have historically supported safe pointers,   
       I remember.   
      
   Sincerely,   
   Seima Rao.   
   [I looked at my S/390 Principles of Operation, and I see a bunch of stuff   
   for tracing, but nothing that looks like safe pointers.  I'd think it was   
   hardware dependent, e.g., if a machine has a fairly clean and efficient   
   trap for an unmapped zero address, you'd use that, but if it doesn't, you'd   
   do something else. -John]   
      
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