Is it possible to detect different colliders with one script ?

Questions & Answers
1

I want to handle in a single object different Colliders (Triggers). If an object enters in one of the colliders, I need to know in which one. Is that possible ?

2

The way it works is that it’s the triggers that receive the messages.
So you need to forward the message to the object entering the triggers.
Something in the like :

// on the Trigger
void OnTriggerEnter (Collider other)
{
    other.gameObject.SendMessage ("Entered", this.gameObject);
}

// on the entering object
void Entered (GameObject trigger)
{
    // do what you need with the given object
}

Now, using SendMessage isn’t the best option performance wise, but it’s enough for prototyping.

You can also use component or interface

// on the Trigger
void OnTriggerEnter (Collider other)
{
    other.GetComponent<Player>.Entered (this.gameObject);
}

// on the entering object
public void Entered (GameObject trigger)
{
    // do what you need with the given object
}