emacs: Other Window

 
 20.3 Using Other Windows
 ========================
 
 ‘C-x o’
      Select another window (‘other-window’).
 ‘C-M-v’
      Scroll the next window (‘scroll-other-window’).
 ‘mouse-1’
      ‘mouse-1’, in the text area of a window, selects the window and
      moves point to the position clicked.  Clicking in the mode line
      selects the window without moving point in it.
 
    With the keyboard, you can switch windows by typing ‘C-x o’
 (‘other-window’).  That is an ‘o’, for “other”, not a zero.  When there
 are more than two windows, this command moves through all the windows in
 a cyclic order, generally top to bottom and left to right.  After the
 rightmost and bottommost window, it goes back to the one at the upper
 left corner.  A numeric argument means to move several steps in the
 cyclic order of windows.  A negative argument moves around the cycle in
 the opposite order.  When the minibuffer is active, the minibuffer is
 the last window in the cycle; you can switch from the minibuffer window
 to one of the other windows, and later switch back and finish supplying
 the minibuffer argument that is requested.  SeeMinibuffer Edit.
 
    The usual scrolling commands (SeeDisplay) apply to the selected
 window only, but there is one command to scroll the next window.
 ‘C-M-v’ (‘scroll-other-window’) scrolls the window that ‘C-x o’ would
 select.  It takes arguments, positive and negative, like ‘C-v’.  (In the
 minibuffer, ‘C-M-v’ scrolls the help window associated with the
 minibuffer, if any, rather than the next window in the standard cyclic
 order; SeeMinibuffer Edit.)
 
    If you set ‘mouse-autoselect-window’ to a non-‘nil’ value, moving the
 mouse over a different window selects that window.  This feature is off
 by default.