Xerox 4050 Installation Planning Manual page 24

CONTROLLER COMPONENTS AND OPTIONS
2-8 XEROX DOCUPRINT NETWORK PRINTER SERIES INSTALLATION PLANNING GUIDE FOR MODELS 4050/4090 NPS
Mouse The mouse is another main method of communicating with the
printer. The mouse has three buttons. The left and right buttons are
used to select NPS functions. The center button provides additional
functions that you will not be required to use. If your workstation has
an optical mouse, it must remain on its designated metallic pad to be
active. If the mouse has a roller ball instead of an optical sensor
underneath, it requires a non-metallic pad.
Note: Printer controller hardware configurations are subject to
upgrade.