If your raid group are using epgp to manage loot, this AddOn will popup when you are removed from the epgp standby list.
Not only is it easier to get yourself added to the list again, but also a nice indicator that you have been removed from said list.
To force open the popup use the slash command /epgpstandby
The AddOn should be working with all localizations of epgp, the text on the popup however will remain english.
If there is anything that you think should be added to this AddOn feel free to post a comment.