{}
{    This procedure is used to cancel an active message that is currently
{ in the operator's message queue.  Upon the issueance of this command
{ the operator's message area and display operator actions display
{ will be updated to reflect that the message has been cancelled. The
{ user task will have to wait for operator acknowldgement of the
{ cancelled message before the next message can be answered.
{}
{       OFP$CANCEL_PRIOR_MESSAGE (STATUS);
{}
{ STATUS (output): This parameter will return the value of normal to
{           caller at all times. This reflects the fact that if there
{           was a message present that message was marked as cancelled.
{           If there was no outstanding message then the routine just
{           returns without any processing.
{}
{
