How to use the navigation.start function in navigation

exports.register = function (props) {
	// Configures the Navigation router with the two routes.
	// This configuration is also used server side to power the JSON Api.
	Navigation.StateInfoConfig.build([
		{ key: 'masterDetails', initial: 'people', states: [
			{ key: 'people', route: '{pageNumber}', component: Component.Listing, defaults: { pageNumber: 1 }, trackCrumbTrail: false, transitions: [
				{ key: 'select', to: 'person' }]},
			{ key: 'person', route: 'person/{id}', component: Component.Details, defaults: { id: 0 } }]
		}
	]);
	// Client renders so React can catch up with the server rendered content.
	// Browsers that don't support HTML5 History won't get this progressive enhancement.
	if (props && window.history && window.history.pushState && window.XMLHttpRequest) {
		Navigation.start();
		render(props);
		registerNavigators();
	}
}