// method to remove a tracking number from a shipment
public static bool RemoveTrack(string apiUrl, string sessionId, object[] args)
{
IShipment proxy = (IShipment)XmlRpcProxyGen.Create(typeof(IShipment));
proxy.Url = apiUrl;
return(proxy.RemoveTrack(sessionId, _sales_order_shipment_removeTrack, args));
}