var other : GameObject; 
other.networkView.RPC("MyFunction", RPCMode.All, "someValue");

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public GameObject other;
    void Example() {
        other.networkView.RPC("MyFunction", RPCMode.All, "someValue");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public other as GameObject

    def Example():
        other.networkView.RPC('MyFunction', RPCMode.All, 'someValue')