Esos aparatos del demonio

Another thing I can do is, since it is an external hard disk, is boot from any Mac to any other Mac. This is also good for backups, restores, repairs, file transfers, and taking advantage of faster systems when all I own is a portable system.

The third thing is dynamic boot options. During bootup I can hit the 'option' key and choose what to boot from. The computer automatically detects all bootable volumes, such as USB keys, CDs, hard disks, and external hard disks, and gives you the choice of which to boot.

There are a bunch of things that plug into EFI and the Framework which allow you to do various neat tricks, from CD playing with the computer 'off' to reading file systems so the machine can boot.

EFI allows vendors to create operating system-independent device drivers. [...]

Ideally, the EFI development model will move the concept of hardware drivers from the operating system back into the lowest level of the PC structure: the hardware itself. Traditionally, when a PC is first powered up, initial device initialization is performed by the BIOS in the PC's default environment—real mode—which dates back to the original IBM PC. The BIOS then turns control over to the operating system while still in real mode. Modern protected mode operating systems, however, cannot use the real mode functions provided by the BIOS. The operating system must therefore use its own protected mode drivers for each piece of hardware it wishes to use. With the EFI model, however, manufacturers will be free to write their own OS-independent hardware drivers which can be included within the device itself and can be directly used by modern operating systems. Such EFI drivers could also be used, for example, to allow the PC to connect to the Internet and retrieve updated drivers even before an OS is installed.