I'm using boost CVS version gotten on Fri Apr 6 11:48:58 EDT 2007. I'm starting to use boost::statechart for the first time. Scanning the available documentation has produced some questions. I found the following text in a C++ comment within the tutorial: context<>() is used to gain access to the direct or indirect context of a state. This can either be a direct or indirect outer state or the state machine itself. 1, What does "direct" "indirect" context mean? It is documented a number of places that the possible types of reactions are: 1. custom-reaction 2. in-state-reaction 3. deferral 4. transition 2. What is the syntax for using an "in-state-reaction", which I assume is a self transition? 3. What is a custom-reaction? 4. What is a deferral?