manage-workers.js

// ... continuing from code above.

// We create the worker, the work can actally begin (but will give the 
// worker a message to start later).
var worker = new UniversalWorker(uri);

// Listen to all messages from the worker.
worker.addEventListener('message', waitForResult, { once: true });

// We send a message to the worker, this can be any primitive or object, 
// including arrays.
worker.postMessage('Start your work');

function waitForResult(resultMessageFromWorker) {
    // ... do something with the result
}