{HEAD ~ The presence} of {TAIL ~ the message} is polled using the first application and, if the message is present, the message is transmitted from the internal storage to the first application for processing 
of
{ HEAD ~ The presence } of { TAIL ~ the message } is polled using the first application and , if the message is present , the message is transmitted from the internal storage to the first application for processing
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH