Ringtome? What's That?

I Thought This Was Horse Drawing Tycoon 2?

And yet, the name "ringtome" keeps popping up in the application.

Okay, it's simple, "ringtome" is the name of the protocol, Horse Drawing Tycoon 2 is the protocol's only working client. You could, for example, make your own game that supports "ringtome" features and functionality that is not Horse Drawing Tycoon 2, by implementing the ringtome protocol. But should you do that? Definitely no, because this protocol is undocumented and constantly changing.