LU 6.2 API Application Programmer's Reference Guide (30294-90008)

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Preface
This manual serves two purposes: It is a training manual for
programmers who wish to create LU 6.2 API applications, and it also
serves as a reference manual.
NOTE The information in this manual can be used to create LU 6.2 API
applications on MPE V systems or MPE XL systems. Any differences
between LU 6.2 API on MPE V and LU 6.2 API on MPE XL are noted in
the manual.
MPE/iX, Multiprogramming Executive with Integrated POSIX, is the
latest in a series of forward-compatible operating systems for the
HP 3000 line of computers.
In HP documentation and in talking with HP 3000 users, you will
encounter references to MPE XL, the direct predecessor of MPE/iX.
MPE/iX is a superset of MPE XL. All programs written for MPE XL will
run without change under MPE/iX. You can continue to use MPE XL
system documentation, although it may not refer to features added to
the operating system to support POSIX (for example, hierarchical
directories).
Finally, you may encounter references to MPE V, which is the operating
system for HP 3000s, not based on the PA-RISC architecture. MPE V
software can be run on the PA-RISC (Series 900) HP 3000s in what is
known as compatibility mode.