V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IAW
       In Accordance With (slang, Usenet, IRC)


The Free On-line Dictionary of Computing (30 December 2018):

IAW

    inactive window.

   Used in talk systems to mean that that person will not be
   taking part in the conversation for a while.  The sadly
   mispelled alternative, "unactive window" (UAW) has also been
   reported.

   (1994-12-05)