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From: hjuvi <hjuvi-google@yahoo.fr>
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Subject: Re: emacs + etags
Date: Thu, 7 Apr 2011 07:32:45 -0700 (PDT)
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You should set tags-file-name variable.
Alternatively, I think you can also use tags-table-list - a list of
all tags files -  but I have never tried... I suppose it will search
in all tags files.