1. A system, operable in a multi-context processor, for allowing a current context to change an event sensitivity of a future context, comprising: a context control register, accessible to said current context, for receiving event mask data defining said event sensitivity of said future context; and a context controller, associated with said context control register and invokable from within said current context, that causes said event mask data to be employed in defining a content of an event mask register of said future context.