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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: TUTORIAL and scroll bar
Date: Wed, 09 Aug 2006 06:29:59 +0300
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> From: Richard Stallman <rms@gnu.org>
> Date: Tue, 08 Aug 2006 19:39:44 -0400
> 
> The tutorial says the scroll bar is on the left.
> Is that true (by default) on all systems?

No.  frame.c initializes the default scroll bar position as follows:

      DEFVAR_LISP ("default-frame-scroll-bars", &Vdefault_frame_scroll_bars,
		   doc: /* Default position of scroll bars on this window-system.  */);
    #ifdef HAVE_WINDOW_SYSTEM
    #if defined(HAVE_NTGUI) || defined(MAC_OS)
      /* MS-Windows has scroll bars on the right by default.  */
      Vdefault_frame_scroll_bars = Qright;
    #else
      Vdefault_frame_scroll_bars = Qleft;
    #endif
    #else
      Vdefault_frame_scroll_bars = Qnil;
    #endif

I guess this is done to be consistent with the defaults of the
respective window-system.