for AddOn authors who are wondering

Just a few points to clarify here for AddOn authors who are wondering:


    The PLAYER_REGEN_DISABLED and PLAYER_REGEN_ENABLED events were given additional meaning starting with 2.0 and are intended to be used by AddOns to get in changes around the buy wow gold combat lockdown. (As per slouken's post above.) This still applies to all combat lockdown related restrictions.
    To be completely clear, the PLAYER_REGEN_ENABLED/DISABLED events are and always have been used to define the start and end of the UI system combat lockdown.
    The UI system lockdown is entirely a client side mechanism which the server has no knowledge of. Everything that the server needs to know regarding combat restrictions is handled through unrelated systems.