Full_Description

   If you are sorting on the entire record using character data, you
   do not need to specify your key field. Otherwise, specify a /KEY
   qualifier for each of the keys, in the order of their priority.
   You can sort on as many as 255 key fields.

   There are three ways to use the /KEY qualifier:

   o  To identify the key field name.

   o  To identify the key field name and to specify sorting order.
      In this case, enclose the field name and the order option in
      parentheses.

   o  As a conditional qualifier, to change the order of records
      in the output file. First, specify a condition name in a
      /CONDITION qualifier, and set up a test for what meets
      that condition. Then, specify the relative order in a /KEY
      qualifier of the form:

      /KEY=(IF condition-name THEN value ELSE value)

      You can use any values to specify the relative order of the
      records.