A couple of questions about Networking.

Hello, I have a couple of questions first off is how would I send an RPC to a completely different object? Like I want to send an RPC from my health script attached to my player, to my spawning script attached to a empty object(The spawner).

Second question how would I delete a object over a network in a certain amount of time? I'm trying to delete particles with Network.Destroy(dust,5); but I doesn't let me. I've also trying to create a separate timer something like -

 if(time > 0)
 {
 Network.Destroy(dust);
 }

but no avail. Thanks for everyone's help!