GNU Emacs Manual - Mode Line Mouse

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## Mode Line Mouse Commands

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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