MAIL$_USER_FIRST

    The Boolean item code MAIL$_USER_FIRST specifies that MAIL$USER_
    GET_INFO return information in the user profile about the first
    entry in the user profile database.

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

    Do not specify MAIL$_USER_FIRST, MAIL$_USER_NEXT or MAIL$_USER_
    USERNAME in the same call to MAIL$USER_GET_INFO.

 MAIL$_USER_NEXT

    The Boolean item code MAIL$_USER_NEXT specifies that MAIL$USER_
    GET_INFO return information in the user profile about the next
    user.

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

    Do not specify MAIL$_USER_FIRST, MAIL$_USER_NEXT or MAIL$_USER_
    USERNAME in the same call to MAIL$USER_GET_INFO.

 MAIL$_USER_USERNAME

    The item code MAIL$_USER_USERNAME points to the username string.

    Specify the address of the username string in the buffer address
    field and specify the length of the username string in the buffer
    length field of the item descriptor.

    Do not specify MAIL$_USER_FIRST, MAIL$_USER_NEXT and MAIL$_USER_
    USERNAME in the same call to MAIL$USER_GET_INFO.

 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.