Example of a server-side managed pickup base behaviour for Unity networking.

Pickup.cs

using UnityEngine;
using System.Collections;


[RequireComponent (typeof (Collider))]
[RequireComponent (typeof (NetworkView))]
public abstract class Pickup : MonoBehaviour
{
	bool available;
	
	
	protected bool Available
	{
		get
		{
			return available;
		}
		set
		{
			if (value == available)
			{
				return;
			}
			
			networkView.RPC ("SetAvailable", RPCMode.Others, value);
			SetAvailable (value);
		}
	}


	[RPC]
	void SetAvailable (bool value)
	{
		available = value;
			
		OnFlipAvailable ();
	}
    
    
	[RPC]
	void GetState (NetworkMessageInfo messageInfo)
	{
		networkView.RPC ("SetAvailable", messageInfo.sender, available);
	}
	
	
	protected abstract bool OnPickup (Player player);
	protected virtual void OnFlipAvailable ()
	{}


	void Reset ()
	{
		networkView.stateSynchronization = NetworkStateSynchronization.None;
		networkView.observed = this;
		collider.isTrigger = true;
	}


	void Start ()
	{
		if (!networkView.isMine)
		{
			networkView.RPC ("GetState", networkView.owner);
		}
	}
	
	
	void OnTriggerEnter (Collider other)
	{
		if (!available || !networkView.isMine)
		{
			return;
		}
		
		Player player = other.transform.root.GetComponentInChildren<Player> ();
		
		if (player != null && OnPickup (player))
		{
			Available = false;
		}
	}
}