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CIGAL Reference Manual, Chapter 4 (Variables): opsys

Opsys -- String variable indicating the current operating system version

OPSYS, a read-only character string variable, is set automatically at start-up based on the operating system's internal version flags.

On Windows, OPSYS is set by a call to the system's GetVersion() function. The low byte from GetVersion is the major version number (stored as xx.0 in OPSYS), the high 16-bits from GetVersion form the subversion (stored as 0.xxx in OPSYS).

See Also:
LIST(2), MACROS(1), MENU(2), RUN(2), STRINGS(1)

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