In a message on 11-02-94, Gary Chambers said to All:

GC> Because of the greater protection OS/2 affords the entire system,
GC> will I be required to write a device driver to access the CPU ring
GC> that allows direct port manipulation?  

In the CONFIG.SYS is a line like IOPL=YES which specifies whether OS/2
will allow programs to access ports directly.  The default of YES allows
all programs to do so, if necessary, and the NO setting prevents all
programs (but not physical device drivers) from doing so. 
Alternatively, you can specify a list of program names to grant access
to some programs but not to all.

As for what else might be required in terms of getting your compiler to
generate code with the proper privileges, others will be able to help
more.  I think you have to tell the compiler which segments will be
accessing I/O ports directly, at least.
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