Orbit:
Click button, depress left mouse button and slide across the screen to rotate the view.
Zoom:
Click button, depress left mouse button and slide the mouse up and down to zoom in and out on the view.
Pan:
Click button, depress left mouse button and slide the mouse across the screen to laterally position the view.
Continuous Orbit:
Click button, then use the Orbit Icon to rotate the view, then release. The view will continue to orbit in the direction of rotation when the mouse button was released. The speed of rotation depends on the speed that the mouse was moving when the button was released.