It's covered in the IBM course (UV905) UniVerse Theory and Practice, which is the 
replacement for UniVerse Internals.  (See 
http://www-306.ibm.com/services/learning/ites.wss/us/en?pageType=course_description&courseCode=UV905)
  

Don't have a copy with me at the moment.  From memory you're on the right track.  The 
MF functions are the low-level functions that work with the rotating file pool.  
MFcheck determines whether an "open" file is currently in or out of the pool, and 
often returns having determined that the file's "in".  MFclose, MFfree and MFopen you 
can probably guess after that!  (Note that MFfree is usually called from MFopen.)

The DB... functions are the higher-level, or logical, functions invoked by the 
UniVerse file manager.  For any file that's not guaranteed a file unit, it's always 
necessary to go via the rotating file pool.

Use the FILEMAP option of PORT.STATUS to map file names to FileNo and Chan.
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