hello.js

var getName = require('name').getName;

exports.hello = function() {
    return "Hello " + getName();
};

index.html

<script type="text/javascript" src="/js/inject.js"></script>
<script type="text/javascript">
  require.setModuleRoot("http://example.com/js/modules");
  require.run("program");
</script>

index_before.html

<script type="text/javascript" src="/js/modules/name.js"></script>
<script type="text/javascript" src="/js/modules/hello.js"></script>
<script type="text/javascript" src="/js/modules/program.js"></script>

name.js

exports.getName = function() {
    return prompt("What's your name?");
};

program.js

var hello = require('hello').hello;

alert(hello());

@Serpenthelm: I believe Inject uses XHR to fetch JS files, so you need a valid domain. This means running locally, without a server, won't work, since a file:/// path is probably not going to be recognized as a valid domain. @jakobo could comment more, but I think you'll need to fire up some sort of server (e.g. apache) to test so you can use localhost as a domain.