Get a context variable. The look-up will chain to above contexts like sort of namespaces or a dynamic cast. Topmost context gets the lookup, like namespaces or prototype chains.
Query a context variable (with the possibility that it doesn't exist). The look-up will chain to above contexts like sort of namespaces or a dynamic cast. Topmost context gets the lookup, like namespaces or prototype chains.
Set a context variable.
A "context" implements per-thread scoped globals. It is a frame in the secundary stack.