The Add and Remove buttons on the dialog are disabled. The dialog ignores this value which it passes as a parameter to the change callback function. The change callback function can return a status code to the code that invoked the dialog box if a pointer to a status variable is passed for this parameter. MustBeZero Set to zero. The function returns a non-zero value on failure.
Failure is returned if the security context is invalid for example.
This function pops up an ownership editor dialog box. The value of this parameter is ignored. Set to 0. This is the instance handle of the application that will be associated with the dialog box. Specify NULL for the local machine.