MScroll X1.w,Y1.w,Width.w,Height.w,X2.w,Y2.w[,SourceBitmapNum.w] ; Copy graphic

Copies an area from within one chunky Bitmap to somewhere in another chunky
Bitmap. The currently used main Bitmap is the destination, and is also the source
unless you specify otherwise. The entire operation should fit within the
dimensions of the chunky Bitmaps and will not be cropped.