GBA Network Boot - Definition and Overview

Netbooting is an ability of the Game Boy Advance. A GBA can receive up to 256 KiB of bootstrap code through the gba link cable, even when no cartridge is present (sometimes known as multiboot or netboot). This is used for multiplayer GBA connections, where multiple GBAs can play with only one cartridge; one GBA with a cartridge sends boot code to the other cartridge-less GBAs. It is usually used for simple multiplayer games due to the limted possible size.