The player's aura of this spell, asked from the client directly: by the ID the player knows, by the ID, then by the spell's name. Undefined when the client does not say (it may still be there: see scanAuras).
Every aura of a unit of a kind, as the client shows it (kept for a moment, so a tick reads the list once).
Forgets the scans of one unit (its auras changed); every scan when unit is undefined.
A unit's aura by its exact name (a totem's effect: "Stoneskin"); undefined when the client does not show it.