1. An article comprising a machine readable medium storing data representing a processor comprising: an instruction set unit to support a first and second instruction sets, problems arising during processing of instructions from said first and second instruction sets respectively causing a first and second set of events; and an event handling unit to cause said processor to execute the appropriate one of a first plurality of event handlers, at least some of said first set of events being mapped to different ones of the first plurality of event handlers, all of the second set of events being mapped to a first event handler of said first plurality of event handlers.