EKA2 (EPOC Kernel Architecture 2) is the second-generation Symbian platform kernel. Like its predecessor, EKA1, it has pre-emptive multithreading and full memory protection. The main differences are: * Real-time guarantees (each API call is quick, but more importantly, time-bound) * Multiple threads inside the kernel as well as outside * Pluggable memory models, allowing better support for later generations of ARM instruction set. * A "nanokernel" which provides the most basic OS facilities upon which other "personality layers" can be built