MSMaskScrollBitmapToShape X1.w,Y1.w,Width.w,Height.w,X2.w,Y2.w[,SourceBitmapNum.w] ;Sten-Copy bm2sh&st2ck

Does the same as MSMaskScroll except that the source is a chunky Bitmap and the
destination is a chunky Shape. The Bitmap's graphic and stencil are mask-copied
to the destination Shape's graphic and cookie, or the Bitmap's graphic is
mask-cut `behind' the cookie-protected areas of the destination Shape's image.