When using the Citrix Appliance lock if you ever need to disable the Windows logon settings to stop using the PNAAgent at log on change the following reg key from
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon "Shell"="C:\Program Files\Citrix\ICA Client\pnagent.exe"
To
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon "Shell"="Explorer.exe"
This will enable Windows Explorer to start during Windows logon and not the PNAAgent.
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