This looks great - really useful! I have always wondered how these virtual desktops work. A cursory looks shows that this is using some undocumented APIs. How

This looks great - really useful! I have always wondered how these virtual desktops work. A cursory looks shows that this is using some undocumented APIs. How do people learn they can create a virtual desktop in this way if the knowledge to do so is hidden/obfuscated? Does apple allow distribution of an app that use these "private" APIs? Is anyone aware of what mechanisms are there for achieving something similar in windows?