How to Emulate Android Market App?

I have developed 3 android applications and hosted in my own site.

Can someone please help me in the following quest开发者_JAVA百科ions I have:

A. With my own Client 1. How to do Silent Installations? 2. How to do Multiple Installations from a URL(User Checks multiple applications from the site and clicks on Download button. And it download applications one by one)? 3. How can I get the information on the uninstalled myown apps from the user mobile. Or how can I check whether one application is installed there or not?

B. Can I Leverage Google's Client services in the Andorid OS to do the above things (Avoiding to create my own client)

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Create a custom build of android with your own original system-certificate application market/installer which talks to your servers rather than Google's.

Otherwise you are talking about spoofing Google's credentials, which is a topic for security research, not development.