Access child windows

[niutech]

We can create a child window using Neutralino.window.create(), but how can we access this child window object? For example, I want to change the URL dynamically in a child window or set its focus. How can I list all child windows of my main NeutralinoJS window?
Finally, how can I make an embedded webview positioned relative to the main window, like BrowserView in Electron?