I'm trying to make dependancies based on if a topic response has been given or not.
What's the best way of doing this?

EDIT: Do I have to make a script for every topic for which I want multiple answers?

I'm not sure what dependencies you're talking about. Can you provide an example?

A dependancy checking if a topic response has been given or not.

I'm not sure what I'm talking about either! From my understanding, it would work this way.

If "global script" = 1

Give topic response.

Otherwise other response, setting the global script to 1.

This is very blurry in my mind. I'd appreciate some directions.

EDIT: For example; you ask an NPC about tomatoes. It isn't a detail important enough to add to the journal, as is done with most quests. However, I don't want him to repeat the same thing if asked a second time.

I think you mean variable, not dependency.
You could just use Function->Talked To PC
Set it to 1 for the second response.

This will reset every 72 game hours, but it saves you from having a Global running all the time.

Same thing, in essence.

I thought the Talked to PC function determined whether or not the NPC had talked to the PC. I wasn't aware of it being usable in the same discussion.

You're right. I guess it would only work for Greetings.

Make a local variable in the NPC's script called talkedtomatos or something distinctive and check to see if it's zero in dialog. If it is, have the NPC talk about the tomatoes, then set the variable to one. That way, the NPC will only talk about tomatoes once and not repeat himself.

Your comment has just deepened my comprehension of the universe we live in -- because local variables are checkable in dialogue.

Possible success and likely failure stories later today.

I know, I use them myself for that very purpose.