1. One or more electronically-accessible media comprising electronically-executable instructions that comprise at least part of an operating system, the at least part of the operating system including: an application programming interface that is capable of creating callback-type dynamic function tables, each callback-type dynamic function table including a begin address, an end address, and a callback function; wherein the operating system calls the callback function when an exception occurs within an address range bounded by the begin address and the end address, the callback function requesting exception handling and/or unwind information from a runtime component.