Technical details on how this works are still unknown. The hardware of the Xbox 360 is very different from the hardware of the Xbox One, and pure emulation of the kind used in console emulators such as MESS and arcade emulators like MAME is technically improbable; Xbox 360 is simply too fast, too new. The limited compatibility and need to download even those games that are owned on disc suggests to us that some mix of recompilation and emulation is in use.
