gistfile1.js

// Primary YUI instance for the page
YUI().use('node', function (Y) {
    Y.Global.on('fooFrame:message', function (e) {
        console.log(e.message);
    });
});

// Create another instance for the iframe
YUI({
    doc: document.getElementById('foo-frame').documentElement
}).use('node', function (Y) {
    // Alias the iframe's global YAHOO for convenience
    var YAHOO = Y.config.win.YAHOO;

    // Subscribe to events from the objects in the iframe's YAHOO
    YAHOO.propertyNS.myDataTable.on("initEvent", function () {
        // and broadcast the events to the Global YUI event target
        Y.Global.fire("fooFrame:message", { message: "DataTable initialized" });
    });
});