All windows: shows or hides
camera objects in all open view windows.
Current window: shows or hides
camera objects only in the current window (the last window you clicked, marked
by a white outline).
Notes:
Toggling
a camera on displays every component of the camera: icons, vectors,
and a complete frustum, including the far clipping plane.
The
icons are displayed in the active color only if the component of
the camera they represent is active. For example, the forward vector
is displayed in the active color if either the eye or viewpoint
is active.