We have tried to document the XBRA protocol, and to illustrate its usage
with some typical code segments. Of course, your application may vary
in many details. The XBRA protocol does a good job of
reliably locating handlers in an exception chain and properly
installing and removing them from the chain. A complete example is
presented in Appendix A. The xbra.h include file from the GNUC
library is presented in Appendix B.