What type of "component?" is a script?

I want to call a function in a c# script from a UnityScript code. I'm using photon unity networking and I can't call an RPC with UnityScript. I want to try having a c# script to do the RPC calls, but I don't know how to reference the c# code. Here's a question that gave me the idea: http://answers.unity3d.com/questions/11206/call-a-function-in-a-different-script-using-javasc.html