Issue 12719 implements dual-head presentation mode, but there should also be
better controls on the control (non-display) monitor.  

CURRENT STATUS
Currently the control monitor disables most controls (such as the menus, the
task pane, etc) except switching slides. 
- If the slide show starts in the slide sorter view, for example, it's very
confusing since it's not possible to change the displayed slides from the slide
sorter view.
- Currently, the user may try to toggle the slide show mode with F5 or the menu
Slide Slide->Slide Show, but both of those are disabled.

Some the requested controls are available through the context menu on the
presentation monitor, but that defeats much of the purpose of multiple monitors.  ;)

SPECS
When a multiple monitor slide show is started, the control monitor automatically
should go into the the new "presenter" view which has these features:
- A button to turn the presentation black.  This would be used, for example, if
there is a problem and the presentation should be aborted.
- A button to abort the slide show.
- A task pane for previewing and changing slides.
- A window to display the current slide (or black if the black-out button is
enabled).
- A window to display the notes of the current slide.
- A status like "Slide [current slide #] of [# of total slides]".
- A timer that begins when the slide show starts. 

COMPETITIVE ANALYSIS
PowerPoint 2003 implements these enhancements as what it calls the "presenter
view" on the control monitor.  

http://office.microsoft.com/en-us/powerpoint/HA010565471033.aspx
http://office.microsoft.com/en-us/powerpoint/HP030893951033.aspx