System update
The System Menu (DSi Menu) is software shipped pre-installed on every DSi which allows the launching of games from official Nintendo certified game carts, "channels", or DSiWare titles. It runs a GUI similar to the Wii's "Wii Menu". The DSi runs in permission modes similar to the Wii, where running in backwards compatibility mode turns off extra hardware and down-clocks the CPU. Using the power button you can soft reset to return to the menu while in game (or in a DSi application), similar to the "Home Menu" on the Wii. Game carts can also be hot-swapped while in the menu.
Versions
Detailed version information is currently unavailable for the Nintendo DSi Menu. More version information will be available pending dumping of the NAND file system and analysis of more individual systems.