Select/Unselect/Invert group                      Gray +, -, *
 These three commands  allows  you  to  select, unselect  and
 invert a group of files. A dialog box appears into which you
 can type a DOS wildcard characters to specify which files to
 select, unselect or invert. For example, "*.doc" selects all
 the files with the .doc extension.

DOS Wildcard Characters
-----------------------
 DOS file names have two parts: the name (which  can be up to
 8 characters) and  the  extension (which  can  be  up  to  3
 characters)  with  a  period   in   between.  For   example,
 "filename.ext".

    *   Match any characters for the  rest  of  the  name  or
        extension.  "a*" will  match "a", "ab", and "abc", as
        well as many others.  '*' applies just to one part of
        the  file  name, so "a*"  will not match "ab.c".  Use
        "a*.*" to find all files that start with 'a' and have
        any extension. (Note: "*a" will match  any  name, and
        not just names with an `a' at the end  as  you  might
        expect.)

    ?   Match  one  character.  So "a?" will match "a", "ab",
        "ac", etc. "????" will match any name with up to four
        characters.

   Notes:
     .  You can use Select group in conjunction with Unselect
        group, Invert group  and  Ins (to  select/unselect  a
        single file) to mark any group of files.

     .  Select group command acts on files  and  directories,
        but Unselect group and Invert grour commands  act  on
        files only.