Conditional Compilation Variables (JScript 5.6) 

The following predefined variables are available for conditional compilation. If a variable is not true, it is not defined and behaves as NaN when accessed.

Variables

Variable	Description
@_win32	True if running on a Win32 system.
@_win16	True if running on a Win16 system.
@_mac	True if running on an Apple Macintosh system.
@_alpha	True if running on a DEC Alpha processor.
@_x86	True if running on an Intel processor.
@_mc680x0	True if running on a Motorola 680x0 processor.
@_PowerPC	True if running on a Motorola PowerPC processor.
@_jscript	Always true.
@_jscript_build	Contains the build number of the JScript scripting engine.
@_jscript_version	Contains the JScript version number in major.minor format.