All literature I see on creating custom handlers deals with associating an extension with a handler, e.g. if I wanted a handler for Ajax requests, I could implement the IHttHandler interface in an AjaxHandler class.
Now, to have individual instances of AjaxHandlers, e.g. DocAjaxHander, PersonAjaxHandler etc. how would I derive the base AJAX handling of my AjaxHandler class without registering each individual *.ajax page?