[latexrefman] \openin & \openout

Hefferon, Jim S. jhefferon at smcvt.edu
Sun Oct 21 23:41:58 CEST 2018

Added a section on these, and adjusted the wording on the ones I added earlier.

The filename situation (what does \openin test.dat open?  what about spaces in filenames?) is most uclear to me, and much googling did not do much to make it less so.  



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