visit-tags-table

visit-tags-table is an interactive autoloaded compiled Lisp function in `etags.el'.

It is bound to <menu-bar> <edit> <goto> <set-tags-name>.

(visit-tags-table FILE &optional LOCAL)

Tell tags commands to use tags table file FILE.
FILE should be the name of a file created with the `etags' program.
A directory name is ok too; it means file TAGS in that directory.

Normally M-x visit-tags-table sets the global value of `tags-file-name'.
With a prefix arg, set the buffer-local value instead.
When you find a tag with M-x find-tag, the buffer it finds the tag
in is given a local value of this variable which is the name of the tags
file the tag was in.