Adobe Flash Player
You would need to have the Adobe Flash Player pluging installed to see a lot of interactive applications.
If Java applets are not seen
It may be necessary to download the Java virtual machine to see Java applets.
Applets graphical interface
Applets interface intends to be simple and coherent.
Solid dots may be moved pointing with the mouse and highlighting and dragging with the left button.
In many applets all the drawing may be dragged by clicking the right mouse button and dragging.