CMUcam2 GUI working with two cameras

[paula]

Hi everybody.
I am working with two cmucam2 in order to get the distance of a target using stereo vision.
I´ve been trying to modify the CMUcam2 GUI so that it can work with both cameras at the same time, but it seems to be difficult to me.
I am using two different com ports (1 camera at com 1 and the other at com 2). The program open successfully the first port but when attempting to open the second one, it fails giving -1 error.
I´ve also tried opening two different instances of the stand-alone CMUcam2 GUI. The first instance open successfully but when trying to open the second one with the other camera at com 2, it cannot open.
I am working in Windows xp. Both ports work fine because i´ve tried them using the GUI with each of them not at the same time.

My question is the following: is there any version of the CMUcam2 GUI which manage to work with two cameras at the same time, each one plugged at a differente com port?
Or if there isn´t, do I have to work with threads in Java in order to access to the ports at the same time, although they are different ports?

Thanks in advance.

Paula