I have a modem installed, but it's internal and uses COM3.
I haven't been able to install the tablet driver, because it tells me 
that COM1 is not available.
Other programs (Hypter Terminal, Tera Term) tell me COM1 and COM3 are 
available (the only two ports on the system), but can't use either one 
because the "telephony device is in use".
What I'm really looking for is a way to tell what process has the serial 
port locked.

Dario Greggio wrote:
> John Pfaff wrote:
>
>   
>> I'm using Windows XP, and can't use one of the serial ports.  
>>     
>
> Hi John, if you're using a Drawing Tablet, then it probably should have 
> its own driver, which "captures" the serial port and won't let you use 
> it from another program.
> To see traffic flowing through COM port, you should unload/disable the 
> driver. Actually, I'm not sure you'd see anything... at times the 
> protocol is kind of hidden and parameters may not be clear.
>
> If you need to test the Port because you feel it's broken, then 
> definitely uninstall Tablet Driver, and use Hyperterminal to do some tests.
>
>
>   

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