or two because all of the system fonts have to be analyzed first.
For future use of LilyPond, you should begin by selecting "New"
-or "Open".
+or "Open". You must save your file before typesetting it. If any errors
+occur in processing, please see the log window.
@subsubheading Windows
Save it on the desktop as @file{test.ly} and make sure that it is not
called @file{test.ly.TXT}. Double clicking @file{test.ly} will process
-the file and show the resulting PDF file.
+the file and show the resulting PDF file. To edit an existing
+@file{.ly} file, right-click on it and select @qq{Edit source}.
+
+If you double-click in the LilyPond icon on the Desktop, it will open
+a simple text editor with an example file. Save it, for example, to
+@file{test.ly} on your Desktop, and then double-click on the file to
+process it. After some seconds, you will get a file @file{test.pdf}
+on your desktop. Double-click on this PDF file to view the typeset
+score. An alternative method to process the @file{test.ly} file
+is to drag and drop it onto the LilyPond icon using your mouse pointer.
+
+Double-clicking the file does not only result in a PDF file, but also
+produces a @file{.log} file that contains some information on what LilyPond
+has done to the file. If any errors occur, please examine this file.
@subsubheading Unix