Can more than one colliders be used for different purposes..????

In my scene I have got a GameObject which has a box trigger collider to act as a boundary for the playable area and destroy any gameobject which exits the collider ..... whereas I have added few more box trigger colliders in the same Gameobject to detect if the player gameobject passes through it or not... The question is how to differentiate between these colliders ... .. I mean how to know which collider is being hit ... (I don't mean ,which gameobject is hitting but which collider ,the player is hitting and get a reference to it)..

Thanks in Advance...