Hard to explain right now, since all of my posts are made from my PSP. Never-the-less, Pandora was the name given to the hack battery that allows you to completely bypass your current firmware. It's basically a hard-boot device. Even allows you to fix bricked PSPs and re-install firmware v1.00 which allows homebrew, unlike the newer more updated firmwares.
Multiboot=allowing to boot to different firmwares, ie custom or sony made.
