javascript - Adding Desktop Notifications to Your Web Applications even if user not in the Web Application or user logged off from the site -

i trying implement browser notification if user not in web application(asp.net mvc web application), can push notifications through browser.is there possible way implement this?also tried

http://blog.teamtreehouse.com/adding-desktop-notifications-to-your-web-applications also.can please help?

if use signalr communicate client-server ,can notification if user close browser,and users session exist in browser?

if understand question correctly, asking not possible web based application. in order post kind of notification desktop not directly triggered web app, in user not have app open in browser, need have process running on user's system polling updates display, falls outside of original question. if asking how can create notifications directly app itself, whether or not tab in focus, have posted answer yourself.