
{   The purpose of this request is to return a link_user_descriptor
{ that has been defined previously by a SET_LINK_ATTRIBUTES command.
{
{     RHP$GET_LINK_USER_DESCRIPTOR (LUD, STATUS)
{
{ LUD: (output) This parameter contains the
{     link_user_descriptor.
{
{ STATUS: (output) This parameter specifies the request status.
{
