Select/Unselect group                          Manual page 128
Gray +, Gray - on the numeric keypad

 These two commands allows you to select and unselect a group
 of files.  A dialog box appears into which you can type a DOS
 wildcard characters to specify which files to select or
 unselect.  For example, "*.doc" selects all the files with
 the .doc extension.

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