No, it’s a C++ API for (among many other things) local functionality such as restarting the app via Steam, triggering achievement pop-ups, controlling the Steam Overlay, and whatnot.

For Electron, there is an integration library called Greenworks. For Neutralino, I haven’t found anything similar, so it might be inconvenient to add Steam-specific functionality down the road.

I’m just raising this limitation because it’s one of a few concerns that steered me away from Neutralino for my Steam port project.