MAIL$_USER_USERNAME

    MAIL$_USER_USERNAME specifies the record to be deleted from
    the user profile database. The buffer address field of the item
    descriptor points to a buffer that contains the user name string
    encoded in a character string 0 to 31 characters long.

    Specify a value from 0 to 31 in the buffer length field of the
    item descriptor.

    Setting bit 4 of DCL_CTLFLAGS, enables the user name string
    encoded in a character string 0 to 255 characters long.

                                   NOTE

       Once this bit is set, user name length is set to a maximum
       of 255 characters long. Even if this bit is cleared, the
       behavior remains unchanged, that is, supports user name
       length of 255 characters long, but there is no way to reset
       it to 31 characters long.

    The item code MAIL$_USER_USERNAME is required.

 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.