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RF Link Help

I have been expiramenting with some RF links (tutorial here, RF link). The tutorial is great, but it only does serial communications. 

The code I use is 


// transmitter.pde


// Simple example of how to use VirtualWire to transmit messages

// Implements a simplex (one-way) transmitter with an TX-C1 module


// See VirtualWire.h for detailed API docs

// Author: Mike McCauley (mikem@open.com.au)

// Copyright (C) 2008 Mike McCauley

Vary basic question about headers

This is a very simple question and I am only asking because it is fundamental to my first robot (and I don't have the money to get this bit wrong).