By default, after you disconnect by closing the page, your session data will be deleted, so unless the administrator of this site has configured this vm as persistant, don't save anything important on this vm and expect to get it back.
If you're seeing this page, your vm is up!
To customize this page, put html that will comprise your ui into the provided ui.html file.
This UI file is served dynamically to clients when they connect.
If you're a user and you're seeing this page, contact the webmaster of this server and tell them to get their stuff together!
In any event, enjoy your vm!