JSI Tip 8962. What is the DirectX Diagnostic Tool (Dxdiag.exe)?

Microsoft Knowledge Base Article 190900 contains the following description:

This article describes the DirectX Diagnostic Tool (Dxdiag.exe) included with Microsoft DirectX. The DirectX Diagnostic Tool is designed to help you troubleshoot DirectX-related issues. The default installation folder for Dxdiag.exe for Microsoft...