This policy setting determines which subsystems are used to support applications in your environment. Note: When you configure this setting you specify a list of one or more objects. The delimiter used when entering the list is a line feed or carriage return, that is, type the first object on the list, press the Enter button, type the next object, press Enter again, etc. The setting value is stored as a comma-delimited list in group policy security templates. It is also rendered as a comma-delimited list in Group Policy Editor?s display pane and the Resultant Set of Policy console. It is recorded in the registry as a line-feed delimited list in a REG_MULTI_SZ value. This policy setting determines which subsystems are used to support applications in your environment.

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(1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options!System settings: Optional subsystems (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\SubSystems!optional