MOCCA is the Message-Oriented Command and Context Architecture, providing a GLUE middle-ware that allows sending commands to a peer which are executed by state-less handlers in a specific context. In contrast to the Request-Response scheme the message flow is not fixed by the framework. This allows to implement different communication paradigms (including Request-Response). The whole system can be seen as an automaton with Messages that trigger state transitions in the local Contexts. This library contains the core components, including the GLUE-based implementation.