+This selects the language for the warning messages.
+@end table
+
+@cindex LANG
+@cindex LILYPONDPREFIX
+
+@node Error messages
+@section Error messages
+
+@cindex error messages
+Different error messages can appear while compiling a file:
+
+@table @emph
+@cindex warning
+
+@item Warning
+ Something looks suspect. If you are requesting something out of the
+ordinary then you will understand the message, and can ignore it.
+However, warnings usually indicate that something is wrong with the
+input file.
+
+@item Error
+Something is definitely wrong. The current processing step (parsing,
+interpreting, or formatting) will be finished, but the next step will
+be skipped.
+
+@cindex error
+@cindex fatal error
+@item Fatal error
+Something is definitely wrong, and LilyPond cannot continue. This
+happens rarely. The most usual cause is misinstalled fonts.
+
+@cindex call trace
+@cindex Scheme error
+@item Scheme error
+Errors that occur while executing Scheme code are caught by the Scheme
+interpreter. When they occur, a call trace of the offending function
+is printed.
+
+@cindex Programming error
+@item Programming error
+There was some internal inconsistency. These error messages are
+intended to help the programmers and debuggers. Usually, they can be
+ignored. Sometimes, they come in such big quantities that they obscure
+other output. In this case, a bug-report should be filed.
+
+@end table
+
+@cindex errors, message format
+If warnings and errors can
+be linked to some part of the input file, then error messages have the
+following form
+
+@example
+ @var{filename}:@var{lineno}:@var{columnno}: @var{message}
+ @var{offending input line}
+@end example
+
+A line-break is inserted in offending line to indicate the column
+where the error was found. For example,
+
+@example
+test.ly:2:19: error: not a duration: 5:
+ \notes @{ c'4 e'5
+ g' @}
+@end example
+
+
+@node Reporting bugs
+@section Reporting bugs
+
+@cindex bugs
+@cindex reporting bugs
+
+If you have input that results in a crash or an erroneous output, then
+that is a bug. We try respond to bug-reports promptly, and fix them as
+soon as possible. For this, we need to replicate and isolate the
+problem. Please help us by sending a good bug-report: an input file
+that will reproduce the problem. Please make it small, so we can
+easily isolate the problem. Don't forget to tell which version you
+use, and on which platform you run it. Send the report to
+@email{bug-lilypond@@gnu.org}.
+
+@node Point and click
+@section Point and click
+@cindex poind and click
+
+Point and click lets you find notes in the input by clicking on them in
+the Xdvi window. This makes it easier to find input that causes some
+error in the sheet music.
+
+To use it, you need the following software:
+@itemize @bullet
+@item a dvi viewer that supports src specials:
+@itemize @bullet
+@item Xdvi, version 22.36 or newer. Available from
+@uref{ftp://ftp.math.berkeley.edu/pub/Software/TeX/xdvi.tar.gz,ftp.math.berkeley.edu}.
+
+ Most @TeX{} distributions ship with xdvik, which is always
+ a few versions behind the official Xdvi. To find out which Xdvi you
+ are running, try @code{xdvi -version} or @code{xdvi.bin -version}.
+@item KDVI. A dvi viewer for KDE. You need KDVI from KDE 3.0 or
+newer. Enable option @emph{Inverse search} in the menu @emph{Settings}.
+
+Apparently, KDVI does not process PostScript specials correctly. Beams
+and slurs will not be visible in KDVI.
+
+@cindex Xdvi
+@cindex KDVI
+@cindex KDE
+
+
+
+@end itemize
+@item an editor with a client/server interface (or a lightweight GUI
+editor):
+
+@cindex editor
+
+@itemize @bullet
+@item Emacs. Emacs is an extensible text-editor. It is available from
+@uref{http://www.gnu.org/software/emacs/}. You need version 21 to use
+column location.
+
+@c move this elsewhere?
+
+There is also support for Emacs: lilypond-mode for Emacs provides
+keyword autocompletion, indentation, LilyPond specific parenthesis
+matching and syntax coloring, handy compile short-cuts and reading
+LilyPond manuals using Info. If lilypond-mode is not installed on
+your platform, then refer to the installation instructions for more
+information.
+
+@cindex Emacs
+@cindex Emacs mode
+@cindex lilypond-mode for Emacs
+@cindex syntax coloring
+
+@item XEmacs. XEmacs is very similar to Emacs.
+
+@cindex XEmacs
+
+@item NEdit. NEdit runs under Windows, and Unix.
+ It is available from @uref{http://www.nedit.org}.
+
+@cindex NEdit
+
+@item GVim. GVim is a GUI variant of VIM, the popular VI
+clone. It is available from @uref{http://www.vim.org}.
+
+@cindex GVim
+@cindex Vim
+
+@end itemize
+@end itemize
+
+
+Xdvi must be configured to find the @TeX{} fonts and music
+fonts. Refer to the Xdvi documentation for more information.
+
+To use point-and-click, add one of these lines to the top of your .ly
+file:
+@example
+#(ly:set-point-and-click 'line)
+@end example
+@cindex line-location
+
+When viewing, Control-Mousebutton 1 will take you to the originating
+spot in the @file{.ly} file. Control-Mousebutton 2 will show all
+clickable boxes.
+
+If you correct large files with point-and-click, be sure to start
+correcting at the end of the file. When you start at the top, and
+insert one line, all following locations will be off by a line.
+
+@cindex Emacs
+For using point-and-click with Emacs, add the following
+In your Emacs startup file (usually @file{~/.emacs}):
+@example
+(server-start)
+@end example
+
+Make sure that the environment variable @var{XEDITOR} is set to
+@example
+emacsclient --no-wait +%l %f
+@end example
+@cindex @var{XEDITOR}
+If you use XEmacs instead of Emacs, you use @code{(gnuserve-start)} in
+your @file{.emacs}, and set @code{XEDITOR} to @code{gnuclient -q +%l %f}.
+
+For using Vim, set @code{XEDITOR} to @code{gvim --remote +%l %f}, or
+use this argument with Xdvi's @code{-editor} option.
+
+@cindex NEdit
+For using NEdit, set @code{XEDITOR} to @code{nc -noask +%l %f}, or
+use this argument with Xdvi's @code{-editor} option.
+
+If can also make your editor jump to the exact location of the note
+you clicked. This is only supported on Emacs and VIM. Users of Emacs version
+20 must apply the patch @file{emacsclient.patch}. Users of version 21
+must apply @file{server.el.patch} (version 21.2 and earlier). At the
+top of the @code{ly} file, replace the @code{set-point-and-click} line
+with the following line:
+@example
+#(ly:set-point-and-click 'line-column)
+@end example
+@cindex line-colomn-location
+and set @code{XEDITOR} to @code{emacsclient --no-wait +%l:%c %f}. Vim
+users can set @var{XEDITOR} to @code{gvim --remote +:%l:norm%c| %f}.
+
+
+
+@refbugs
+
+When you convert the @TeX{} file to PostScript using @code{dvips}, it
+will complain about not finding @code{src:X:Y} files. These complaints
+are harmless, and can be ignored.
+
+
+
+@node Invoking ly2dvi
+@section Invoking ly2dvi
+
+Nicely titled output is created through a separate program:
+@file{ly2dvi} is a script that uses LilyPond and La@TeX{} to create a
+nicely titled piece of sheet music, in DVI format or PostScript:
+
+@example
+ ly2dvi [@var{option}]@dots{} @var{file}@dots{}
+@end example
+
+To have ly2dvi read from stdin, use a dash @code{-} for @var{file}.
+
+Ly2dvi supports the following options:
+
+@table @code
+@item -k,--keep
+ Keep the temporary directory including LilyPond and ly2dvi output
+files. The temporary directory is created in the current directory as @code{ly2dvi.dir}.
+@item -d,--dependencies
+ Write @code{Makefile} dependencies for every input file.
+@item -h,--help
+ Print usage help.
+@item -I,--include=@var{dir}
+ Add @var{dir} to LilyPond's include path.
+@item -m,--no-paper
+ Produce MIDI output only.
+@item --no-lily
+ Do not run LilyPond; useful for debugging ly2dvi.
+@item -o,--output=@var{file}
+ Generate output to @var{file}. The extension of @var{file} is ignored.
+@item -P,--postscript
+ Also generate PostScript output, using dvips. The postscript uses
+the standard @TeX{} bitmap fonts for your printer.
+@item -p,--pdf
+ Also generate Portable Document Format (PDF). This option will
+generate a PS file using scalable fonts, and will run the PS file
+through @code{ps2pdf} producing a PDF file.
+
+@cindex PDF
+@cindex Scalable fonts
+
+ If you use lilypond-book or your own wrapper files, do not use
+@code{\usepackage[[T1]@{fontenc@}} in the file header but do not forget
+@code{\usepackage[latin1]@{inputenc@}} if you use any other
+non-anglosaxian characters.
+
+@item --png
+ Also generate pictures of each page, in PNG format.
+@item --psgz
+ Gzip the postscript file.
+@item --html
+ Make a .HTML file with links to all output files.
+@item --preview
+ Also generate a picture of the first system of the score.
+
+@cindex preview
+@cindex picture
+@cindex bitmap
+@cindex pixmap
+@cindex thumbnail
+@cindex screenshot
+
+@item -s,--set=@var{key}=@var{val}
+ Add @var{key}= @var{val} to the settings, overriding those specified
+in the files. Possible keys: @code{language}, @code{latexheaders},
+@code{latexpackages}, @code{latexoptions}, @code{papersize},
+@code{pagenumber}, @code{linewidth}, @code{orientation},
+@code{textheight}.
+@item -v,--version
+Show version information.
+@item -V,--verbose
+Be verbose.
+@item --debug
+Print even more information. This is useful when generating bugreports.
+@item -w,--warranty
+Show the warranty with which GNU LilyPond comes. (It comes with
+@strong{NO WARRANTY}!)
+@end table
+
+@subsection Titling layout
+
+Ly2dvi extracts the following header fields from the LY files to
+generate titling; an example demonstrating all these fields is in
+@inputfileref{input/test,ly2dvi-testpage.ly}:
+
+@table @code
+@item title
+ The title of the music. Centered on top of the first page.
+@item subtitle
+ Subtitle, centered below the title.
+@item poet
+ Name of the poet, left flushed below the subtitle.
+@item composer
+ Name of the composer, right flushed below the subtitle.
+@item meter
+ Meter string, left flushed below the poet.
+@item opus
+ Name of the opus, right flushed below the composer.
+@item arranger
+ Name of the arranger, right flushed below the opus.
+@item instrument
+ Name of the instrument, centered below the arranger.
+@item dedication
+ To whom the piece is dedicated.
+@item piece
+ Name of the piece, left flushed below the instrument.
+@item head
+ A text to print in the header of all pages. It is not called
+@code{header}, because @code{\header} is a reserved word in LilyPond.
+@item copyright
+ A text to print in the footer of the first page. Default is to
+ print the standard footer also on the first page.
+@item footer
+ A text to print in the footer of all but the last page.
+@item tagline
+ Line to print at the bottom of last page. The default text is ``Lily
+was here, @var{version-number}''.
+@end table
+
+
+@cindex header
+@cindex footer
+@cindex page layout
+@cindex titles
+
+
+
+@subsection Additional parameters
+
+Ly2dvi responds to several parameters specified in a @code{\paper}
+section of the input file. They can be overridden by supplying a
+@code{--set} command line option.
+
+@table @code
+@item language
+ Specify La@TeX{} language: the @code{babel} package will be
+included. Default: unset.
+
+ Read from the @code{\header} block.
+
+@item latexheaders
+ Specify additional La@TeX{} headers file.
+
+ Normally read from the @code{\header} block. Default value: empty.
+
+@item latexpackages
+ Specify additional La@TeX{} packages file. This works cumulative,
+so you can add multiple packages using multiple @code{-s=latexpackages} options.
+ Normally read from the @code{\header} block. Default value:
+@code{geometry}.
+
+@item latexoptions
+ Specify additional options for the La@TeX{}
+@code{\documentclass}. You can put any valid value here. This was
+designed to allow ly2dvi to produce output for double-sided paper,
+with balanced margins and pagenumbers on alternating sides. To achieve
+this specify @code{twoside}.
+
+@item orientation
+ Set orientation. Choices are @code{portrait} or @code{landscape}. Is
+read from the @code{\paper} block, if set.
+
+@item textheight
+ The vertical extension of the music on the page. It is normally
+ calculated automatically, based on the paper size.
+
+@item linewidth
+ The music line width. It is normally read from the @code{\paper}
+block.
+
+@item papersize
+ The paper size (as a name, e.g. @code{a4}). It is normally read from
+the @code{\paper} block.
+
+@item pagenumber
+ If set to @code{no}, no page numbers will be printed. If set to a
+positive integer, start with this value as the first page number.
+
+
+ @item fontenc
+ The font encoding, should be set identical to the @code{font-encoding}
+ property in the score.