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MPE/iX, Multiprogramming Executive with Integrated POSIX,
is the latest in a series of forward-compatible operating systems
for the HP e3000 line of computers.
In HP documentation and in talking with HP e3000 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 e3000s, not based on the PA-RISC architecture.
MPE V software can be run on the PA-RISC HP e3000s in what is known
as compatibility mode.
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