Indicates the access method for the connection of the file.  It
  takes the following form:

  ACCESS = acc

  acc  Is a character expression with one of the following
       values:

  'DIRECT'           Access by record number
  'SEQUENTIAL'       Access sequentially (the default)
  'KEYED'            Access by a specified key
  'APPEND'           Access sequentially, after the last record
                      of the file