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A reminder to me of the structure of the ::SHE+ILA:: $A opcode : Starting with the nibble $A, then comes the LBA (SegID) of the segment, then a $D nibble, and then the offset. For nested buffers, there may follow more ($D, offset) pairs. Finally, an $E nibble on the end completes the address element. For efficiency, the offsets are applied to the LBA (SegID) and stored in a kernel-accessible address register (extending the TLB).