For an overview of EXCHANGE and a listing of the EXCHANGE command
    names, enter the HELP command with no arguments.

    If you enter HELP and the name of an EXCHANGE command, HELP
    displays a description of the command followed by a list of
    related qualifiers. For information on any of the related
    qualifiers, enter the qualifier name at the prompt.

    You can also obtain information on any EXCHANGE command qualifier
    by entering HELP, the command, and the qualifier at the EXCHANGE
    prompt, as follows:

    EXCHANGE> HELP COPY/CONTIGUOUS

    For information on a qualifier with options, enter HELP, the
    command, the qualifier, and the option at the EXCHANGE prompt.

    If you specify an asterisk (*)  in place of any keyword, the HELP
    command displays all information available at that level.

    If you specify an ellipsis ( . . . ) after any keyword, the HELP
    command displays all information relating to that keyword.

    You can specify percent signs and asterisks in the keyword as
    wildcard characters.