How do you set a Quest Variable?

[KazFoxsen]

I'm using this tutorial:

http://geck.bethsoft.com/index.php/How_to_script_conversation_between_two_or_more_NPCs

 

and it says "Create a quest variable to track the progress of the conversation (say MS40.convo). Conditionalize the first info with this variable (GetQuestVariable MS40.convo == 0), plus whatever additional variables are necessary (e.g. GetIsID, GetStage, etc.)."

 

How do you create this?

[davidlallen]

If you work through the tutorials in order, starting with the simpler ones, it describes about quest variables.