Android market initiate remote download

I would like to kno开发者_开发问答w how the android market initiates the remote download through their website. I'm guessing there is some sort of push notification system. I want to know if it's possible to do the same thing using a different web interface.

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The only possibility I see is to use the C2D (Cloud to Device) messaging API provided by Google. In that way you could send an install intent to the device. However that would always open the market locally on the device from which the user can then install the app.

Obviously Google can bypass these "limitations" :)

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They use Android Cloud to Device Messaging (C2DM). They allow anyone with a server of their own to implement this service.

From the site:

Android Cloud to Device Messaging (C2DM) is a service that helps developers send data from servers to their applications on Android devices. The service provides a simple, lightweight mechanism that servers can use to tell mobile applications to contact the server directly, to fetch updated application or user data. The C2DM service handles all aspects of queueing of messages and delivery to the target application running on the target device.