Window procedures in ScreenRec not populated by DDX driver. why?

[kumar vemuri]

Hi,

  In most of the reference DDX driver implementations, the Pixmap
procedures (CreatePixmap, etc) are being implemented by the driver and
also are getting populated in the ScreenRec structure by the driver. But
none of the Window procedures (like CreateWindow, DestroyWindow ...) are
being implemented by the drivers. 

Can someone throw a hint as to why the Window procedures of ScreenRec
are not being implemented by the driver whereas the Pixmap procedures
are?

(I checked with a couple of reference implementations and this is a
common observation.)

Thanks
-K
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