[ACS] ENTER but only for the first join?

[Cutman]

I need an ENTER script that only triggers upon the player first joining the game, but not after hitting spectate and rejoining again. Is there any way to do this? DISCONNECT scripts also trigger when a player hits spectate so I can't even have a server variable to keep track of that.

[Ænima]

Have that script flip a boolean switch? And also make that script instantly terminate if it finds that the bool is already positive?