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Default value: varies
The opsys variable tells which operating system
version of Epsilon is running, using the following macros defined in
OS_DOS, defined as
1, indicates the DOS version or one of the Windows versions is
running. (See the is-gui variable to distinguish these.)
OS_OS2, defined as 2,
indicates the OS/2 version is running.
OS_UNIX, defined as 3,
indicates the UNIX version is running.
System Primitives (Primitives)
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