when you do the heroic missions at a certain point you will get a emote across your screen that says something to the effect of "you notice a shimmer of light from the corner of your eye. this will signal that 2 things have happened. 1 or more nammeds from the normal zone have spawned in your instance for you to kill at your leisure. and the other thing is, the collection clickies popped as well. normally i think ive been finding 3 clickies per.
side note: when taskadding someone be sure theyre in zone or get into zone (instance) at end to get creds, otherwise it will be for naught. found this out the hard way.