Thanks agraham for the quick response, I thought that might be the answer but hoped.. it's for desktop and i'm using port 7879..the data comes in streams sometimes short sometimes long ones..one complete message is 13 lines long like so:-
<MODESMESSAGE>
<DATETIME>20091208162929</DATETIME>
<MODES>4CA700</MODES>
<CALLSIGN>RYR3513</CALLSIGN>
<ALTITUDE>36000</ALTITUDE>
<GROUNDSPEED>424</GROUNDSPEED>
<TRACK>191</TRACK>
<VRATE>0</VRATE>
<AIRSPEED>000</AIRSPEED>
<LATITUDE>48.6544</LATITUDE>
<LONGITUDE>-5.8470</LONGITUDE>
<SQUAWK>2210</SQUAWK>
</MODESMESSAGE>
Thanks again Dave Lewis.