Client Side Extensions

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When a group policy is being processed on a Windows-based computer, client-side extensions are the components that interpret the stored policy and make the appropriate changes to the environment. In troubleshooting a given extensions' application of policy, the administrator can view the configuration parameters for that extension. These parameters are in the form of registry values.

Each client-side extension is identified by a subkey beneath the following path:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\GPExtensions
The subkey name takes the form of a Globally Unique Identifier (GUID). For more information about identifying registered group policy client-side extensions, see the following article in the Microsoft Knowledge Base:

216357 (http://support.microsoft.com/kb/216357/EN-US/) Identifying Group Policy Client-Side Extensions

Registry Values for Client-Side Extensions
The following registry values may be present for each client-side extension. Note that some of these values may not be present. In this case, the default specified is used by the client extension.

Value: DllName
Type: REG_EXPAND_SZ
Data: <Client-side extension DLL>

Value: ProcessGroupPolicy
Type: REG_SZ
Data: The function within the client-side extension to be called when group policy processing is passed to this extension.

Value: NoMachinePolicy
Purpose: Determines whether the client extension will process a group policy when a machine policy is being applied.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Process
• 0x1 = Do not process
Default: 0 (zero)

Value: NoUserPolicy
Purpose: Determines whether or not the client extension will process a group policy when a user policy is being applied.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Process
• 0x1 = Do not process
Default: 0x0 = This extension will process a user group policy normally.

Value: NoSlowLink
Purpose: Determines whether or not the client extension will process a group policy when a slow link is detected.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Process
• 0x1 = Do not process
Default: 0 (zero)

Value: NoBackgroundPolicy
Purpose: Determines whether or not the client extension will process a group policy when a background refresh of the group policy occurs.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Process
• 0x1 = Do not process
Default: 0 (zero)

Value: NoGPOListChanges
Purpose: Determines whether or not the client extension will process a group policy when there are no changes between the cached list of GPOs previously processed and the current list.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Process
• 0x1 = Do not process
Default: 0 (zero)

Value: PerUserLocalSettings
Purpose: If enabled, user policies are cached on a per-user and per-machine basis.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Disabled
• 0x1 = Enabled
Default: 0 (zero)

Value: RequiresSuccessfulRegistry
Purpose: If enabled, requires the successful registration of client-side extension components to occur before it processes a group policy.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Disabled
• 0x1 = Enabled
Default = 0 (zero)

Value: EnableAsynchronousProcessing
Purpose: Determines whether or not a group policy will continue processing while the client extension is performing operations.
Type: REG_DWORD
Data:
• 0 (zero) or value not present = Synchronous
• 0x1 = Asynchronous
Default = 0 (zero)

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