You can use it. You must host the cross-access policy file service on the service bus (the service that serves this file). An example of a service that does this is provided on the Clemens Vaster blog. (just google, it's on msdn website). It is included in the reverse web proxy.
You must use the rest of the APIs in the queue. See Http Queue Example Included in the SDK.
Please note that using Silverlight you will have to use async libraries.
Jonathan
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