Hi,
I just studied some pictures over at airliners.net, to find out whether the WXR is integrated in the ND or not, obviously it is, but I spotted an additional screen on some panels, that is located in the upper center of the pedestal between the FMC units:
http://www.airliners.net/photo/TAP-Port ... 77c501df24
As the TCAS obviously is integrated in the VSI, I wonder what this is for...?