The mouse icon area shows depictions of the actions of the mouse buttons appropriate
to the Action selection and the current Object.
Depressing a mouse button will highlight an icon. Releasing the mouse button will remove the
highlight from the icon. M1 is the left mouse button, M2 is the middle mouse button
and M3 is the right mouse button. You do not have to click on these icons. They are
presented on the screen for information only. Figure 1.
If the current Object is Surface, and surface transforms are invalid, then the mouse icons will
be blank and no transformation can take place. Surface transforms are invalid, for
example, if the surface belongs to a transformed region. If the current Object is
Region, and region transforms are invalid, then the same will occur.
