Alternative to ENVIRON Function for 2013 r2


I want to know alternative function or any other method fof ENVIRON function for 2013 R2.

It’s necessary to pass through DotNet interoperability, for example:

Name DataType Subtype
environment DotNet System.Environment.‘mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089’



I don’t have idea about Microsoft DotNet interoperability for Dynamics NAV 2013R2, i still need learn this feature or fucntionality, anyways Thanks for your suggestion.