1 FIXSTRING
 A command procedure which will replace all occurences of a
 string  with a replacement string in a set of files.  The file
 names  may be individually  specified or may be wildcarded. 
2 parameters
 There are 5 parameters which are needed by the procedure:
 
  P1 -- A directory name.  You may use wildcards and ... to cause
        more than one directory to be searched.  See HELP SPEC FILE
        for more about directory specifications.

  P2 -- The search string.  Should be enclosed in quotes if passed
        in the command line to execute the procedure.

  P3 -- The replacement string. Should also be put in quotes if 
        passed in the command line.

  P4 -- The list of file names to search.  The default is *.com
        The list may have more than one name separated by commas, and
        may include wildcarded file specs.

  P5 -- AND string for searching.  If specified, substitutions will
        be made only on lines that contain both the SEARCH and AND
        strings.  Will not be prompted for if null.
 In interactive mode, the procedure will prompt for values not supplied
 and will ask for verification on the expanded directory specification.
2 examples

 @MEC_UTILITY:FIXSTRING [MINE.TEST] "DRA1:" "MEC$USER1:" *.COM
 Replaces all occurrences in [MINE.TEST]*.com.

 @MEC_UTILITY:FIXSTRING [MINE.*] "DRA1:" "MEC$USER1:" *.COM
 Replaces all occurrences in [MINE.*]*.com.

 @MEC_UTILITY:FIXSTRING cad:[SOURCE...] "OLDVALUE" "NEWVALUE" *.TXT
 Replaces all occurrences in cad:[source...]*.txt

 @MEC_UTILITY:FIXSTRING mec$user2:[.*cad*...] -
             "OLDVALUE" "NEWVALUE" *.TXT,*.com
 Replaces all occurrences in mec$user2:[.*cad*...]*.txt,*.com
