Description

   The DCX$ANALYZE_INIT routine initializes the context area for a
   statistical analysis of the data records to be compressed. The
   first (and typically the only) argument passed to DCX$ANALYZE_
   INIT is an integer variable to contain the context value. The DCX
   facility assigns a value to the context variable and associates
   the value with the created work area. Each time you want a
   record analyzed in that area, specify the associated context
   variable. You can analyze two or more files at once by creating a
   different work area for each file, giving each area a different
   context variable, and analyzing the records of each file in the
   appropriate work area.