For example, the presentation program OpenOffice.org Impress does not have
a dual-screen display feature (as of version 2.0). This missing feature is vital for certain
live presentations, because it permits an operator to preview and select the next
slide to appear using a control screen that is not visible to the audience. This is used
in churches to handle unexpected changes in the flow of the service??”such as a
songleader deciding to repeat a chorus??”and it is used in business meetings to jump
directly to appropriate slides during Q&A sessions.
Until this feature is added to Impress, overlapping Xinerama windows provide a partial
solution. When operating with the default user interface layout, Impress provides
a display with three panes: a slide preview, an enlarged image of the current
slide, and a task plane with layouts that can be applied to slides.
By configuring the X server to display the control screen at high resolution (such as
1440 ?— 1050 or 1280 ?— 1024) and the projector screen at a lower resolution (800 ?—
600), with the projector screen positioned as a subset of the control screen, it is possible
to simulate two-screen operation. Figure 4-4 shows the contents of the control
screen, and Figure 4-5 shows the contents of the projector screen using this configuration.
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