1    /ALL

       /ALL
       /NOALL (default)

    Return all messages shown by the last DIRECTORY command. Unless
    /NOCONFIRM is specified with /ALL, you will be required to
    confirm any RETURN/ALL operation.

2    /CONFIRM

       /CONFIRM
       /NOCONFIRM (default)

    When /CONFIRM is specified, you will be prompted to confirm each
    message return operation.

3    /LOG

       /LOG (default)
       /NOLOG

    Specifies whether informational messages for each message return
    operation are generated.