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+## Loading the worker code from a file (main side)
+
+When writing code for threads we have both code that executes in the main thread and code that 
+executes in worker threads. When the code is small, it may be handy to have all code in a single file
+but it is often clearer to split the code apart when the worker code starts to grow.
+
+This example demonstrates how we can package the worker code in a separeate file and
+load it with `t.load`.
+
+We are going to keep the same logic as in our previous 'ping pong' example, but just repackage
+it slightly differently.
+
+In this file we keep only the ping (main) side:
+
+``` javascript
+// Creating the worker thread
+var Threads = require('webworker-threads');
+var t = Threads.create();
+
+// Listening to 'data' events from the worker thread
+t.on('data', function(n, result) {
+	console.log('fibo(' + n + ') = ' + result);
+	if (n < 40) t.emit('next');
+	else console.log('bye!'), t.destroy();
+});
+```
+
+At this point we load the worker code:
+
+``` javascript
+t.load(__dirname + '/ex04_worker.js');
+```
+
+And we start the game by emitting the first `next` event:
+
+``` javascript
+t.emit('next');
+```
+
+### Output
+
+```
+fibo(1) = 1
+fibo(2) = 2
+fibo(3) = 3
+fibo(4) = 5
+...
+fibo(39) = 102334155
+fibo(40) = 165580141
+bye!
+```