Ajax is an exciting web technology that allows us to send asynchronous request to the webserver. This means that the webpage does not refresh when you hit the send event or media control buttons!
Note that most of the default GMLs in Girder require the player to be foreground to control it, thus if you are viewing this page locally media control is bound not to work. Note that you can change this behaviour of the GML files to also control media players that do not have the focus.
Sending Events Through Ajax
The webserver also supports AJAX. It sends events asynchronously.
Media Control through website
Of course by sending these events we can also control any media player hooked into the system.