The Yahoo Group "SAE_Talk" has the Charlie Tuner Manual in its "Files" as a downloadable .pdf file. You'll have to join the group to gain access, but that's simple to do -- I just did it to check to make sure it's there and that the descriptions of the button colors *is* in the manual.
http://groups.yahoo.com/group/SAE_Talk/files/Manuals/
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http://groups.yahoo.com/group/SAE_Talk/files/Manuals/
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