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The openSuSE 12.3 KDE Live Desktop
The openSuSE Live ISO image is UEFI and Secure Boot compatible, so I don't need to change anything in the system BIOS to boot it.
Depending on the boot device priorities on your system, you may need to press the Boot Select key (variously ESC, F9, F12 or whatever) and then select the CD/DVD/USB device containing the openSuSE Live image. The installation process can then be started by selecting the Install icon on the desktop.