NOTE: In version V0.16.0, the approach depicted here has changed. For procedure calls, the concept of CHANNEL has been implemented, and PORTS are no longer primitives in their own right. A PORT still can be seen as a Message Queue with ownership, but stops there, not advancing for Procedure Calls, the unique concern of CHANNELS. … Continue reading RK0 V0.8.0 – A Message-Passing kernel, if you want.