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Logical Unit

Suite of IBM protocols that control communications over an SNA (Systems Network Architecture) network. LU0 uses SNA transmission control and flow-control layers. LU1, LU2, and LU3 control host sessions. LU4 supports peer-to-peer and host-to-device communications between peripheral nodes. LU6.2 is the peer-to-peer protocol of APPC (Advanced Program-to-Program Communication).

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