Hello,
I have tried the registry solution suggested in the post by "luismenez..." (http://forums.ni.com/ni/board/message?board.id=170&message.id=216513#M216513).
The solution seems to work: different names can be assigned to "identical" (same brand/same model) cameras. Modifying the windows registry, however, is not an ideal solution and it makes the system unstable to certain operations (for example, if you disconnect a webcam and then replug it in, the system crashes and you get a blue screen). As mentioned by luis, it is VERY IMPORTANT to create a Windows restore point (using "system restore" in the "system tools" folder within "accessories").
I found it convenient to use the program "Registrar Registry Manager" in place of "regedit". A lite version of the program can be downloaded at:
http://www.resplendence.com/registrar.htm
To change the camera names, plug in one webcam at a time, do a search for its name as displayed by IMAQ USB Enumerate Cameras, select all the entries in the registry where the camera name appears as data, and replace the camera name with a different one. Then plug in the next camera and do the same.
I can't state strongly enough, that THIS IS NOT AN IDEAL solution, and it would be preferrable to know what part of the registry to modify so as to not cause problems with the system or better still, have a driver which allowed to customise the camera name without entering the registry.
If anyone has a better solution, please post it here. Thanks.