Select/Unselect group                          
Gray +, Gray - and Gray * on the numeric keypad.

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

 The Gray * key inverts the current selection by unselecting
 all the files which are selected, and selecting all the files
 which are not selected.

   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.

Restore Selection
 This command can be used to restore a previously selected
 group. So if you have just copied a group of files to a
 directory and want to recopy them somewhere else you can
 restore the selection group and simply copy them again.