You can specify the name of a file where SCA will look for an
  occurrence of a symbol.  SCA selects all occurrences in the files you
  specify.

  Click on this button or the File Entry box to activate this
  selection.  Enter the name or names of the files that you want SCA to
  use.  Use a comma to separate multiple file specifications.  You may
  use wildcard characters, as defined by your particular operating
  system, in the file specifications.