WPF / WCF Push Notification

Does .NET 3.5 (WCF, or other) offer any type of push notification service?

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ME: I have a server and a client. I want a service to run on the server and if x happens then push a notification to the client. I don't want to pull the server every x minutes to gather the information. – Jeremy H (23 hours ago)

Kent: Yep, look at WCF callbacks. – Kent Boogaart (22 hours ago)

ME: Looking into that now. Thanks Kent. – Jeremy H (22 hours ago)

From stackoverflow

• Your question couldn't be any more general, but I'm going to take a guess and suggest you look at WCF callbacks.

  I doubt your question relates to WPF or even WF, but you will need to elaborate if you think otherwise.

  HTH, Kent

  Jeremy H : I have a server and a client. I want a service to run on the server and if x happens then push a notification to the client. I don't want to pull the server every x minutes to gather the information.

  Kent Boogaart : Yep, look at WCF callbacks.

  Jeremy H : Looking into that now. Thanks Kent.