The sandboxing and codsigning stuff exists in Mac OS X as well. `man sandbox-exec` and `man codesign`. The latter is being pushed for use in Mac OS X by Apple a

The sandboxing and codsigning stuff exists in Mac OS X as well. `man sandbox-exec` and `man codesign`. The latter is being pushed for use in Mac OS X by Apple as well; to provide easier keychain authentication for applications, for example. As for multitasking? Spawning proesses is handled by launchd/Darwin/that part of the OS. Thats shared between Mac OS X and iOS. Just a different UI, similar(ish) to command tab, though.