Strange behavior of the Microsoft Bluetooth stack under windows 7

Question

I'm linking some Zebra, Intermec printers, etc via bluetooth ...

The behaviour is:

1. The printer is linked, for exmple, to the port COM9
2. I send data to the printer and it works fine
3. After printing, I connect via Hyperterminal to send commands to the printer, and it shows that the port COM9 is in use
4. If I try again to print from another source, like notepad, word, etc, it works fine

Is there any way to find out what is using the port COM9 that is not letting the Hyperterminal to connect properly?

Thank you.

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Bluethood Drivers Version: 6.1.7601.17607

Date Bluethood Drivers: 21/06/2006