Make the application visible in, or hidden from the running task list.
First available in version 3.0 build 2039.
flag - A boolean value that indicates whether your application appears in the running task list or not.
No output parameters.
When this method is called synchronously, a return object containing the output parameters is returned to the caller immediately.
Applications cannot be hidden from the running task list on Windows NT, Windows 2000 or Windows XP.