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  You can use mouse clicks on window mode lines to select and manipulate
windows.
- Mouse-1
 - 
Mouse-1 on a mode line selects the window above.  By dragging
Mouse-1 on the mode line, you can move it, thus changing the
height of the windows above and below.
 - Mouse-2
 - 
Mouse-2 on a mode line expands that window to fill its frame.
 - Mouse-3
 - 
Mouse-3 on a mode line deletes the window above.
 - C-Mouse-2
 - 
C-Mouse-2 on a mode line splits the window above
horizontally, above the place in the mode line where you click.
 
  C-Mouse-2 on a scroll bar splits the corresponding window
vertically.  See section Splitting Windows.
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