Render Items

The Render Item always occupies the top spot in the Shader Tree; this is no mistake considering its importance. It can be thought of as a general container for global scene render settings. When the Render Item is selected, its various attributes become available in the Properties viewport. It is broken into three sub-tabs of related settings: Frame, Settings and Global Illumination:

Render Item: Frame

Render Item: Settings

Render Item: Global Illumination