How to use existing hook in twentytwelve to all theme of wordpress?

A hook can only be implemented via actual function call. It is not possible without adding that call to theme template directly or via other method (calling it inside another, already available, hook for example).

There is Theme Hook Alliance initiative to promote more standardized hooks in themes and increase flexibility, but adoption have been low so far and usually hooks in theme are specific to it or (at best) to a theme framework used.

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