Making enemys smart enough to open doors?

[Seragath]

Okey okey..Let me just understand this with a path node..If I place a path node somewhere on my map. Does any monster that walks by follow it (If it somehow detects the player) or am I forced to use the command "AddEnemyPatrolNode" So that the monster knows it's attached to that exact path node ?. If that's the case and "AddEnemyPatrolNode" is not needed at all...I'll get a better understanding why my monsters have horrible, horrible ai pathing.