Understanding LUA and SNA

The IBM® LUA access method provides an application programming interface (API) for secondary dependent logical units (LUs). LUA consists of system software and interfaces that supply input/output (I/O) service routines to support communications using LU types 0, 1, 2, and 3 SNA protocols. The RUI and SLI interface of LUA is supported.

The Communications Server is designed to be binary compatible with Microsoft NT SNA Server and similar to the implementation of Communications Server/2.

The services that LUA provides to application programs include only those that support data communications; LUA does not provide any device emulation facilities. However, LUA does provide a unique subset of presentation services layer functions.

Communications Server must be installed and configured before an LUA application program can run on the workstation. Refer to Quick Beginnings for information about installing and configuring Communications Server.