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The ECLiPSe system has been developed under the UNIX
operating system.
The interface to the file system, process communication and
environment are closely related to the corresponding UNIX
facilities.
Unfortunately a few features are only available on UNIXes of the
Berkeley family, not on System-V.
However they were considered useful enough not to leave them out
for portability reasons.
Some features are therefore not supported on some System-V versions.
Since there is a trend to unify the different UNIXes, these incompatibilities
will hopefully disappear in the future.
ECLiPSe's operating system interface consists of a collection of built-in
predicates and some global flags that are accessed with set_flag/2,
get_flag/2 and env/0. They are described in the following sections.
1999-08-06