Support for Multiple Multi-Touch Screens

hello,
I have written some code that implements the multi-touch and it has been working fine with just one multi-touch screen.  However, someone using my program with 2 multi-touch screens hooked up is getting no input from the second device.  I did not
see anything documentation referring to more than one multi-touch device, although the existence of hSource in the TOUCHINPUT structure would imply multiple devices are supported.  After searching the forums, I found this post
http://social.msdn.microsoft.com/Forums/en-US/tabletandtouch/thread/9c11871d-945c-4f7b-bdaa-a1b1452959b8/
in which someone stated that 2 multi-touch monitors should work fine, but not with simultaneous input.  Since the post is almost 2 years old, I am wondering if anything has changed, and whether this might be the problem my user is having.  Or is
there some way to tell if it is a driver issue?  I am not using the gesture library, just retrieving data with GetTouchInputInfo.  I'll appreciate if anybody can point me to documentation or mention their experiences with multiple devices.
thank you.

thank you for your quick reply.  I have gotten a few more details and the problem is not the scenario you suspected.  They are using 1 window spanning 2 multi-touch monitors.  The problem does seem to be related to simultaneous input.  If
they have a finger down on the first monitor, my program does not receive any events from the second monitor.  If they are not pressing down on the first monitor, the input from the second monitor comes through.
Does Windows 7 support simultaneous input from 2 or more multi-touch monitors?  Is there something I have to do so that my program will work correctly?  Or are there driver specific issues, and if so, where can I get help for that?
thank you.

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