MAIL$_MESSAGE_BACK

    When you specify the Boolean item code MAIL$_MESSAGE_BACK,
    MAIL$MESSAGE_COPY copies the message preceding the current
    message.

    Specify the value 0 in the buffer length and buffer address
    fields of the item descriptor.

    Do not specify MAIL$_MESSAGE_BACK, MAIL$_MESSAGE_ID, and MAIL$_
    MESSAGE_NEXT in the same call to MAIL$MESSAGE_COPY.

 MAIL$_MESSAGE_DEFAULT_NAME

    MAIL$_MESSAGE_DEFAULT_NAME specifies the default file
    specification of a mail file to open in order to copy a message.
    The buffer address field of the item descriptor points to a
    buffer that contains a character string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 MAIL$_MESSAGE_DELETE

    When you specify the Boolean item code MAIL$_MESSAGE_DELETE,
    MAIL$MESSAGE_COPY deletes the message in the current folder after
    the message has been copied to a destination folder.

    Specify the value 0 in the buffer length and buffer address
    fields of the item descriptor.

    Specify MAIL$_MESSAGE_DELETE to emulate the operation of MAIL
    MOVE or FILE command.

 MAIL$_MESSAGE_FILE_ACTION

    MAIL$_MESSAGE_FILE_ACTION specifies the address of the mail
    file action routine called if a mail file is to be created. Two
    parameters are passed as follows:

    o  User data longword

    o  Address of the descriptor of the file name to be created

    The buffer address field of the item descriptor points to a
    longword that denotes a procedure value.

 MAIL$_MESSAGE_FILENAME

    MAIL$_MESSAGE_FILENAME specifies the name of the mail file to
    which the current message will be moved. The buffer address
    field of the item descriptor points to a buffer that contains
    a character string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 MAIL$_MESSAGE_FOLDER

    MAIL$_MESSAGE_FOLDER specifies the name of the target folder
    for moving mail messages. The buffer address field of the item
    descriptor points to a buffer that contains a character string 0
    to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

    The item code MAIL$_MESSAGE_FOLDER is required.

 MAIL$_MESSAGE_FOLDER_ACTION

    MAIL$_MESSAGE_FOLDER_ACTION specifies the entry point address of
    the folder action routine called if a folder is to be created.
    Two parameters are passed as follows:

    o  User data longword

    o  Address of a descriptor of the folder name to be created.

    The buffer address field of the item descriptor points to a
    longword that specifies a procedure value.

 MAIL$_MESSAGE_ID

    MAIL$_MESSAGE_ID specifies the message identification number of
    the message on which the operation is to be performed. The buffer
    address field of the item descriptor points to a longword that
    contains the message identification number.

    Do not specify MAIL$_MESSAGE_BACK, MAIL$_MESSAGE_ID, and MAIL$_
    MESSAGE_NEXT in the same call to MAIL$MESSAGE_COPY.

 MAIL$_MESSAGE_NEXT

    When you specify the Boolean item code MAIL$_MESSAGE_NEXT, the
    Mail utility copies the message following the current message.

    Specify the value 0 in the buffer length and buffer address
    fields of the item descriptor.

    Do not specify MAIL$_MESSAGE_BACK, MAIL$_MESSAGE_ID, and MAIL$_
    MESSAGE_NEXT in the same call to MAIL$MESSAGE_COPY.

 MAIL$_MESSAGE_USER_DATA

    MAIL$_MESSAGE_USER_DATA specifies data passed to the folder
    action and mail file action routines. The buffer address field
    of the item descriptor points to a user data longword.

    Specify MAIL$_MESSAGE_USER_DATA with the item codes MAIL$_
    MESSAGE_FILE_ACTION and MAIL$_MESSAGE_FOLDER_ACTION only.

 out_item_list

    OpenVMS usage:itmlst_3
    type:         longword
    access:       write only
    mechanism:    by reference
    Item list specifying the information you want the routine to
    return. The out_item_list argument is the address of a list of
    item descriptors, each of which describes an item of information.
    The list of item descriptors is terminated by longword value of
    0.