First of all, thank you, both of you.
Well, what I am trying to do is display an exclamation mark (special effect) over a quest giver when a quest is available to a specific player, and then remove it after you've talked to them, etc. So this will be at different times for all players. Let's say I've got 3 player slots for my game. Do I need to make an SFX variable per player, to store the data in? (Because I'll need to destroy an exclamation point per player?)