Starts the application silently (in the tray). The main window can be opened by clicking the tray.
git clone https://github.com/jpl42/Better-Tray-Menu.git
nw nw-sample-apps/Better-Tray-Menu/
Change frame to true in package.json. Remove anything relating to window-button, exit-button and minimize-button in the files main/index.html, main/style.css and main/script.js.