ADS&Gaussian Random variable

It is in a help file. It is called, IID_Gaussian
file:///d:/ADS2004A/doc/numeric/csnum0817.html

Thanks for the reply!

It seemed that IId_Gaussian is a component of Agilent Prolemy Communcation System Simulation. How to use this simulation tool? And does it require special licenses? I am a newbie in this field and hope get some information about it.