How to send cross application notification?

Apr 28, 2014 at 11:02 PM
How to send cross application notification between WF and MVC?
I have some long running activities that i want to create using WF. The front end is developed using MVC 5. I'm not able to decide which approach should i take to accomplish the following:

1>The workflow should get invoked when user click a button on UI, however even if the browser is closed WF should keep executing.
2>My WF service has 5-6 sequential activities, I want WF to notify MVC application when certain activities are completed.

I was planning to use “CallExternalMethodActivity” and “ExternalDataExchangeAttribute” however they are obsolete in .Net 4.5

What are my options in .Net 4.5? any help, suggestions would be really appreciated