**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:**\\
[[jvs:cigal:manual:chapter2:list|LIST(2)]], 
[[jvs:cigal:manual:chapter1:macros|MACROS(1)]], 
[[jvs:cigal:manual:chapter2:menu|MENU(2)]], 
[[jvs:cigal:manual:chapter2:run|RUN(2)]], 
[[jvs:cigal:manual:chapter1:strings|STRINGS(1)]]

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