Hi ChanaruS,

Thanks for posting on PSC.

I am not able to understand your requirement much(forgive me for that).

  -  Could you provide a detailed description and business scenario with an example?

As per my understanding, you want to use Pega Application as service? And by "Single Page Application" meaning UI screen to provide/update real-time data? Rectify me, if I went completely odd. 

Though, if I am close to your requirement. 

You can create a service package to invoke a flow/create a work object and perform the user activity or updating or as per your requirement. 

Meanwhile, in the background, you can update different users/countries with post-processing activity on the called flow. 

Hope it helps you, kindly notify if it does.

Regards,

Asif

Starting from version 7.2.2 Pega supports push notifications to browser clients, This is helpful to create real time application

https://pdn.pega.com/real-time-applications-and-push-notifications-pega…