VMS Help APPEND, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 input-filespec[,...]

    Specifies the names of one or more input files to be appended.
    Multiple input files are appended to the output file in the order
    specified. If you specify more than one input file, separate each
    file specification with either a comma (,)  or a plus sign (+).

    The asterisk (*) and the percent sign (%) wildcard characters are
    allowed in the input file specifications.

 output-filespec

    Specifies the name of the file to which the input files will be
    appended.

    You must specify at least one field in the output file
    specification. If you do not specify a device or directory, the
    APPEND command uses the current default device and directory.
    Other unspecified fields default to the corresponding fields of
    the first input file specification.

    If you use the asterisk (*)  wildcard character in any fields
    of the output file specification, the APPEND command uses the
    corresponding field of the input file specification. If you are
    appending more than one input file, the APPEND command uses the
    corresponding fields from the first input file.