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Persistance of COM Port

I executed Serial Port application. Before this application stops execution, I am calling VISA Close to close the opened serial port. But persistance of COM Port is still available till I exit LabVIEW. Why is it so?
Thanks in Advance
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In Continuation to previous message,
After closing Serial Port Application, I am able to execute other serial port access vi's in Labview. But I am not able to open the same COM Port in other applications like VB, C, Hyperterminal till I exit LabVIEW.
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can you send me VI for review  (LV version 7.1 maximum) ?

I had this problem in the past too. Needed to close "VISA resource name" ;

try to add closing by "".



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