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With the Editor for the Logitech Presenter R400 you can setup which commands should be executed upon a certain button press.
First, check the "Enabled" check box. To enable / disable the Logitech Presenter e.g. from a Custom Script Button, these commands are available.
Now, click one of the buttons  to  to assign a custom WD command to it. The selected button will be displayed above the scripting field, e.g.: "Button 1 Press Script".
In the text box you may enter commands to be executed. The topic Script Language explains this in more detail.