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The EFI specification was primarily intended for the next generation of IA architecture-based computers, and is an outgrowth of the "Intel® Boot Initiative" (IBI) program that began in 1998.
EFI Specifications page was updated to include Microsoft related EFI specifications.
EFI Presentations was updated to include Spring 2004 IDF EFI sessions.
EFI is a significant departure from this structure.
EFI also allows the operating system to run in a sandbox mode, where networking and memory management issues are delegated to the firmware instead of the OS.
EFI is one of the pieces of the framework necessary to implement Trusted Computing, which is mainly a method to implement hardware-based Digital rights management.