Canon XEED WUX450 - Manual (Page 244)

Using the Projector in Classroom Mode
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(7) Layout area
Lists computers selected for projection.
(8) Projection status
Indicates the projection status.
(9) Computer
A number is shown here only when secondary monitor connectivity is activated
on the computer you are using. Clicking the number will switch between the
primary and secondary monitor.
(10) Blank the computer
Pause projection from the computer. Click again to resume projection.
(11) Settings
Display the setting window. ( P268 )