SS>Can I ask a stupid question as a newbie to OS/2 programming?  (Gee, maybe
SS>I should buy a book ).  What is "thunking"?  I've
programmed for DOS
SS>for quite awhile, but never heard the term until I started reading this
SS>area...thanks!

If you are writing a program using 16 bit segments (offset:segment
addressing) and you need to call a routine in one of the 32 bit (flat
addressing) segments, OS/2 has to convert any addresses from 16 bit to
32 bit before calling the 32 bit segment.  The reverse is also true.  If
you are writing the program using a 32 bit segment and call one of the
(few) 16 bit OS/2 functions, the 32 bit addresses must be converted to
16 bits before the call proceeds.  This 16:32 bit conversion is called
thunking.  It is what allows a 32 bit operating system like OS/2 to run
16 bit software like all of the DOS programs you are used to.
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