Service Bus for Windows Server SDK

Hy,

I have a question to the Service Bus for Windows Server SDK. It is possible to access the Service Bus via the two ways

1. Service Bus for Windows Server SDK

http://msdn.microsoft.com/en-US/us-en/library/jj542419.aspx

2. REST

Is the Service Bus for Windows Server SDK also in the background a REST implementation so the SDK is only a wrapper and the code behind is also access the service bus with the help of REST?

Best regards