When windows performs these diagnostic test what command set does it use?

When Windows performs diagnostic tests, it primarily utilizes the Windows Management Instrumentation (WMI) and various command-line utilities such as sfc (System File Checker), chkdsk (Check Disk), and DISM (Deployment Imaging Service and Management Tool). Additionally, it may leverage PowerShell cmdlets for more advanced diagnostics and troubleshooting. These tools help identify and resolve system issues, file corruption, and performance problems.