The Hotkeys PlugIn allows to change slideshow on-the-fly by pressing a hotkey. It is also possible to open a windows and select the SlideShow.
This plugin can be used in a home theater system or in a digital photo frame to change the slideshow by pressing a key or by using a remote control.
HotKeys v1.4.0
After downloading, double-click the downloaded file in Windows Explorer to start the installer.