Why pushNotification in windows phone?

Question

I have a contact list and if I want to search any contact in search box if i type 'a' then it show all the contact which has 'a' in its contact name..
How can I perform this searching operation in windows.

In search box if I type 'c' then it show the name
Bruce Atwood
Ronald Vincent
Nigel Cedric

Answer 1

Push notifications provide a way for web services to push data to users' devices without waiting for a game to initiate the web request.

Push notifications can be sent from any source that can make a web request: a server, a desktop PC, even another Windows Phone.