Hello. I'm trying to add a variety of dialogue to existing NPCs, and since I'm fairly new to the CS, I'd love some help. I've tried googling, but haven't found much for the following issues.

1. Is there a "say once" function for dialogue? (Googling only produced TalkedtoPC, which doesn't apply). I'm trying to add a greeting to an NPC who already knows the PC, but I'd like them to only say it once.

2. This may sound silly, but having read through several guides, I still can't understand how Random100 works. What values do I input if I have, say, 2 or 3 options I want an NPC to randomly say? I will be using them with PC faction and rank conditions, if that makes a difference.

Thanks so much.