Variable: tags-table-list
tags-table-list is a customizable variable defined in etags.el.gz.
Value
nil
Documentation
List of file names of tags tables to search.
An element that is a directory means the file "TAGS" in that directory.
To switch to a new list of tags tables, setting this variable is sufficient.
If you set this variable, do not also set tags-file-name.
Use the etags program to make a tags table file.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/etags.el.gz
;;;###autoload
;; Use `visit-tags-table-buffer' to cycle through tags tables in this list.
(defcustom tags-table-list nil
"List of file names of tags tables to search.
An element that is a directory means the file \"TAGS\" in that directory.
To switch to a new list of tags tables, setting this variable is sufficient.
If you set this variable, do not also set `tags-file-name'.
Use the `etags' program to make a tags table file."
:type '(repeat file))