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In this paper we discuss the assignment of priorities to the execution of remote procedure calls in distributed real-time systems that are programmed using the Distributed Systems Annex (DSA) of Ada 95. We first discuss the current priority model used in the Glade implementation of the DSA. We then present some theoretical results that show that a more flexible priority assignment methodology can provide much better schedulable utilization levels. Based upon these results we propose an implementation that would allow using this priority assignment methodology in Glade. Finally, we propose new features for a future DSA that would allow prioritizing remote procedure calls in a flexible manner.