Just wanted to know if it is possible to create a hidden window using javascript?
You can also create a new window visible only in taskbar with this workaround:
window.open(path.html,'_blank', 'toolbar=no,status=no,menubar=no,scrollbars=no,resizable=no,left=10000, top=10000, width=10, height=10, visible=none', '');
that open a window in a position not visible by user. I have used this trick different times.