SYNOPSIS:
    bus: A communication path for camera coordinates.

DESCRIPTION:
    Each /camera/ in the eccet system is also attached to a
    "position bus".
    This is a communication path that can be set up to make
    other instances of Eccet (local or remote) track the
    position of the camera in question.

SEE ALSO:
    camera, BUS_SEND, BUS_RECEIVE, BUS_LINK
