Original from  Daniel Lynes  to Denis Tonn on 12-05-1996
Original Subject: Protected mode differ

                         ---------------------------------------

  DT> Can you give some specific examples of what Win95 is doing and the 
  DT> same under OS/2?
 
DL>  Yes, sure, although not the actual code, as it's been changed to take care
DL>  of the problem.  The problem was that I was inadvertently reading code from
DL>  outside my allocated memory.  Win95 gave me a GPF; OS/2 Warp did not.

 Looks like you are reading from a shared code address. The
"locations" of these addresses can vary from OS/2 system to system,
never mind between Win95 and OS/2. 

 From the sound of things, you might benefit from a reading of Deitel
and Kogan's "Design of OS/2". It will give you a pretty good overview 
of the "architecture" of OS/2. If you do the same thing for a Win95 
book you should see that although both implement "protected memory", 
this memory will not be at the same locations. 

 Your code example could just as easily have worked the opposite way 
if the "address" were different. You managed to find an address that 
is "shared code" used by your process under OS/2 while that same 
address is not a "shared address" under Win95. 
 

   Denis       

 All opinions are my very own, IBM has no claim upon them
. 
. 
.
--- Maximus/2 3.01