Programming

This is quite unclear to me, the definition of global object seem to be "The global object provides variables and functions that are available anywhere".

Now this surely means that the global variable environment contains variables available everywhere in the other scopes, but does this also mean that, for example, the window object is at the higher end of the scope chain? As in JS everything is an object, is this true for the prototype chain too? Because from my notes Object.prototype looks to be at the top of the prototype chain.

In fact if i do: Object.getPrototypeOf(window) i get WindowPrototype { … }

but if i do: Object.getPrototypeOf(Object.prototype) i get null

Another thing unclear to me is what is the difference between window (lowercase) and Window (uppercase).. I know that uppercases are usually used for constructors, is this the case too? Is Window a constructor and window an object? If so, what's the purpuose of the Window constructor?