Different pieces of the operating system use software interfaces to cooperate with other pieces of the operating system. An example of this is the Stage 2 Manager, which provides one interface that is used by display modules and a second interface that is used by CPU detection modules.
Note: This area does not include the public Kernel API (see [ hasn't been written yet]), or the "Stage 1 Interface" that is defined by the BCOS Transition State 1 Specification.