Switching input signal
The projector can be connected to multiple devices at the same time. However, it can only display one at a time. To cycle through the available input sources, press the SOURCE button. A source selection menu will display at the center of the screen after you press the button.
The brightness level of the projected image will change accordingly when you switch between different input signals. Data (graphic) "PC" presentations using mostly static images are generally brighter than "Video" using mostly moving images (movies).
The input type affects the options available for the Application Mode. See "Selecting an application mode" on page 25 for details.
Hiding the image
In order to draw the audience’s full attention to the presenter, you can press the BLANK (or BLANK / 5Up) button to hide the screen image. Press the button again to restore the image. The word “BLANK” appears at the bottom right corner of the screen while the image is hidden.
You can set the blank time in the 
Advance
> Blank Time menu to let the projector return the image automatically after a period of time when there is no action taken on the blank screen.
Do not block the projection lens from projecting as this could cause the blocking object to become heated and deformed or even cause a fire.
Remote paging operations
You can operate your display software program (on a connected PC) which responds to page up/down commands (like Microsoft PowerPoint) by pressing Page Up and Page Down on the remote control. See "Connecting a computer" on page 16 for details.
Connect the projector to your PC or notebook with a USB cable prior to using this function.
Freezing the image
Press the Freeze button on the remote control to freeze the image. An
icon 
will display in the lower right corner of the screen. To release the function, press the Freeze button on the remote control, or the SOURCE button.
This does not remotely control the signal source. It just freezes the currently projected image.