If your enterprise contains AS/400 systems, display sessions are provided via APPC using the 5250 data stream. SNA Server computers provide APPC access to AS/400s using 5250 emulation clients. Clients can only communicate with AS/400s using APPC.
For 5250 services, the local APPC LU acts as an identifier for local SNA Server clients; the remote APPC LU identifies the AS/400 system. Figure 6.5 shows the local and remote LUs used for this configuration.
Figure 6.5 APPC elements in a 5250 configuration.