NXC  Version 1.2.1 r5
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#define MS_500   500

500 milliseconds

Examples:
alternating_tasks.nxc, ex_dispgout.nxc, ex_NXTSumoEyes.nxc, ex_playsound.nxc, ex_ReadSensorHTAngle.nxc, ex_ReadSensorMSPlayStation.nxc, ex_xg1300.nxc, ex_yield.nxc, and util_rpm.nxc.