Procedure Vecho(var msg: message_packet_type; var stat: VI_status_type);
   EXTERNAL;
{*USER*
 
Echo (send) the message packet in MSG to all currently connected forms.
This insures that all forms show the current value.  Note that the
echo goes also to the form that orignially sent us the update.  The
reason for this, is that there may have been some other echoed values
sent to the form that were processed by the form AFTER the operator
made the current udpate.  This will restore the field value to
the one the operator made.  This insures that the "last" entry on
any connected form "wins".
 
STAT will always be returned as IV_SUCCESS
regardless of whether any messages were actually sent.
 
*ERROR CODES*
 
IV_SUCCESS - Sends have been done to all connected forms.
             If a send fails for a connected form, it will be
             dropped from the list of connected forms.  If
             there were no connected forms, no sends were needed.
 
 
}