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For remotely accessible UE MRs, this translates to the following. - Relative Addressing: {job ID, endpoint, RKEY} identifies the MR. - Absolute Addressing: {endpoint, RKEY} identifies the MR with optional MR job-ID access control check. In addition, UE memory registration supports user-defined RKEYs. This enables programming model implementations the optimization to use well-known per process endpoint RKEYs. For relative addressing, this could result in the same RKEY value existing multiple times at the {job ID} level, but only once at the {job ID, endpoint} level. The UE remote MR relationship would look like: Job <- 1 --- 0..n -> EP <- 0..n ---------------------- 1 -> PD ^ ^ |--- 1 --- 0..n -> MR <- 0..n --- 1 ---| > There's discussion on defining this relationship: > > Job <- 0..n --- 1 -> PD > > I can't think of a technical reason why that's needed. >From my UE perspective, I agree. UE needs to share job IDs across processes while still having inter-process isolation for things like local memory registrations. Thanks, Ian