For a good read on WinPE, check out the Microsoft Docs

Winlogon

Winlogon.exe is executed on startup. This will read the WinPE Registry at HKLM\System\Setup for the CmdLine value. By default this is winpeshl.exe. When winpeshl.exe executes, it reads values from winpeshl.ini

Winpeshl.ini

ConfigMgr: TSBootShell.ini

[Shell]
OrgName=OSDeploy
EnableDebugShell=true
Run=X:\sms\bin\x64\TsmBootstrap.exe /env:WinPE /configpath:%CONFIGPATH%

Startnet.cmd

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