Can't use OnTriggerEnter

In my game a have a trigger and I want to catch event, when player come inside it.
But script posted not to the same object, where posted trigger.
That’s why I can’t use OnTriggerEnter, because I have a lot of triggers and I don’t know, how to specify desired.

Ah looked at the last question you asked and I answered that one as well, it was a similar issue and looks like you use C#, which is good. On your object with the trigger add this, Change OtherScript to match the script name you want to access.

private OtherScript otherScript;

void Start()
{
    // reference the other script
    otherScript = GameObject.Find("Player").GetComponent<OtherScript>();
    //or
    otherScript = GameObject.FindGameObjectWithTag("Player").GetComponent<OtherScript>();
}

void OnTriggerEnter(Collider other)
{
     if(other.tag == "Player")
     {
          otherScript.triggered = true;
     }
}

void OnTriggerExit(Collider other)
{
     if(other.tag == "Player")
     {
          otherScript.triggered = false;
     }
}

Then on the script you want to pass the onTrigger to (OtherScript) set a public bool triggerd

public bool triggered = false;

void Update()
{
     if(triggered)
     {
          // do what you want here
     }
}

Just typed that direct into the answers so watch out for typos!

Hope it helps.