This property sets the name of the user that owns the client
certificate that will be used to establish a secure connection with
the server. If this property is not set, the certificate store for the
current user will be used when searching for the certificate. If this
property is used to specify another user, the process must have the
appropriate permission to access the registry location that contains
the client certificate. On Windows Vista and later versions of the
operating system, this requires that the process run with elevated
privileges.