This class provides a way to iterator over all of the public system variables and get their names, data type, range (if applicable), read-only status, and how they are stored. 

System variables that have their secret flag set or that have a "*" as the first character in their name are skipped by this iterator.

Autodesk.AutoCAD.Runtime.DisposableWrapper
    Autodesk.AutoCAD.Runtime.SystemVariableEnumerator

Public sealed Class SystemVariableEnumerator
Inherits DisposableWrapper
Inherits IEnumerator

public sealed class SystemVariableEnumerator : DisposableWrapper, IEnumerator;