Get your applicant tooltip to show, then type "/fstack" (you might have to make it "/framestack", it's the same thing, oh, and leave the quotes out - I just put them there
), hit "enter" and put your mouse over the tooltip. This'll give you a new window in one corner of your screen with everything that is under your cursor. In that information will be the name of the tooltip that you're looking for.
Type it again to stop it.