This setting defines whether the system should wait for the logon scripts to complete before starting the user’s shell. This function can also be controlled on a per user basis by modifing the same value at:
[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
Note: The value in [HKEY_CURRENT_USER] section take precedence over [HKEY_LOCAL_MACHINE].
Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
Value Name: RunLogonScriptSync
Data Type: REG_DWORD
Data: (0 = disabled, 1 = enabled)