Regarding Alec's signal plot: Alec's shard and Ezri's symbiont are going to communicate directly; they speak a similar native language of 'sharing memories back and forth.' As part of communicating-via-memory during telepathic links like this, Dax (the symbiont) can surface or outright trigger memories in other people (in this instance, in Alec). When memories are triggered this way, Dax/Ezri would also experience the memory in the moment as if it's her own.

Question is: Can I spend/donate Dax's points to trigger one of Alec's memories?