If I understand correctly you have Telerik Reporting Server (CTP) and have uploaded a TRDX file there. Now you need to access the same TRDX file from another custom application that has its own HTML5 viewer, such integration is predicted for future releases where the server will be usable from different clients.
With the available builds, you will need to created a separate application with its own HTML5 viewer, Reporting REST service and copy of the report (TRDX). For the purpose please check the HTML5 Viewer Quick Start
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