Also worth noting: users and administrators are totally separate object types. The `show users` shows user objects. These can be used to log in to a remote access VPN and the like, but cannot be used to log in to SmartConsole. This can be a big source of confusion for a lot of people not already familiar with Check Point.
There is a separate `show administrators` API command, which I believe has been there since APIv1.0 with R80.
Edit: I just realized 'show administrators' only works on an MDS. There does not appear to be a way to view the administrators on a normal SmartCenter via the API.