It sounds like you’re referencing a specific debug output, log entry, or status message — likely from a Windows kernel or driver debugging session (possibly with Checked builds, Cep21reg.exe being a test or registry-related tool, and “Checked 4” being a step or sub-check).
C:\Users\[YourUsername]\AppData\Local\Temp\CEP\~/Library/Logs/CEP/User Authentication: Verifying student or administrator credentials. Cep21reg.exe - Checked 4
System Log Entry: