File State diagnostic shader
Shades the surfaces using the last active environment that was saved when you last saved the file.
The settings for the last active environment are stored with the File State button when you save your file. The settings are saved with the file, so anyone opening the file can set the environment to your last active environment using this button.
You can change the settings associated with the File State button by clicking the button and using the File State options. Save the file to save the new settings with the button.
File State Options
Shade Settings
Click this button to adjust the hardware shading settings in the Hardware shade dialog box.
Environment Editor
Click this button to adjust the environment settings in the Environment Editor.