{
{   The purpose of this request is to provide a means for an application
{ to permit another application to send messages to it.  MLI adds the
{ sender application's name to the list of applications which are
{ permitted to send messages to it.
{
{        MLP$ADD_SENDER (APPLICATION_NAME, SENDER_NAME, STATUS)
{
{ APPLICATION_NAME: (input) This parameter specifies the application
{        name by which the calling program identifies itself to MLI and
{        other applications.
{
{ SENDER_NAME: (input) This parameter specifies the name of the application
{        which the calling application is allowing to send messages to it.
{        If a NULL value is given for this parameter, public permission
{        to send messages to the calling application will be granted (i.e.,
{        any application will be allowed to send messages to it).
{
{ STATUS: (output) This parameter specifies the request status.
{        The following status values may be returned by this request:
{           mlc$busy_interlock
{           mlc$dup_permits_ignored
{           mlc$ok
{           mlc$permit_list_full
{           mlc$receiver_name_syntax_error
{           mlc$receiver_not_signed_on
{           mlc$sender_name_syntax_error
{           mlc$system_name_no_match
{

