Watch as hypothetical new NPC Aqualung responds to Tolgerias's terms:
INTERJECT_COPY_TRANS TOLGER 75 AquaTolger
== AQUALUNJ IF ~IsValidForPartyDialogue("Aqualung")~ THEN ~Hey, that's a really crummy offer! Where did those little girls go? I could be sitting on a park bench, I don't need this aggravation! Who are you, anyway?~
== TOLGER IF ~IsValidForPartyDialogue("Aqualung")~ THEN ~You poor old sod, you see it's only me. Now, did anyone else have a smart remark they wanted to make?~
END

So, if Aqualung is around, we'll hear from him and then Tolgerias will respond to him. After that, the game will look for the presence of Edwin, Jaheira, Yoshimo, and Korgan and we'll get their responses to Tolgerias as well.

Deciding to join the Shadow Thieves (first when giving gold to Gaelan, and then when talking with Aran Linvail)
Joining Bodhi's guild.
Accepting to go to Trademeet
Saving Viconia
Accepting to kill the gnome patrol in Underdark
Accepting to kill Solaufein in Underdark
Entering the bridge discrict and learning about the murders from the Inspector Brega.
After the fight with bandits, where you find some guy who's poisoned and asks that you return him to the Harper Hold.
Tolgerias asking you to find Valygar. When he asks you to agree to the task before telling you what it is.
When your inside the palace at sudenessalar. 
When (if) you sleep with Phaere.
Hendak's quest to save the kids in the slaver ship.
Accepting Firkraag's quest in the CC.
When entering the second floor of the tanner's house (where all the traps are).
When finding Inspector Brega dead if you found the evidence and told him.
When poisoning the Druid Grove.
Yoshimo's betrayal
When entering the Underdark.
Kalah
Planar Prison
Planar Sphere
