I've just put a new set of image/changes/w95 vm on my website which adds the
primitive error return value idea to methods calling primitives. Theres a
trivial example in SimpleMIDIPort to illustrate the concept. 'Fixing' all the
other prims would be simple if the idea is popular.
See http://sumeru.stanford.EDU/tim/pooters/SqFiles/release/Sq23bNCM-ER.zip for
the full pre-made set and
http://sumeru.stanford.EDU/tim/pooters/SqFiles/deltas/PrimErrRet.zip  for the
change sets.

tim

-- 
Sure it's user-friendly...if you know what you're doing.
Tim Rowledge:  rowledge at interval.com (w)  +1 (650) 842-6110 (w)
 tim at sumeru.stanford.edu (h)  <http://sumeru.stanford.edu/tim>