What Troglobite said. LK Avalon TSF and, um, non-LK Avalon TSF may differ in their internal coding, but they are both able to read the same level files and both may have levels passed to them via command line, which are the only ways this program really interacts with such executables.

So, folks, tell me about the Multiplayer checkbox in Level Properties. Do you ever use it? (I don't.) In your ideal world, what function would it have, if any?