-name of an object in that module, which should be a callable of three
-arguments. When files of the given extension are handled, that
-callable is called with the file's absolute path, the WSGI environment
-and the WSGI `start_response' function, in that order. For example,
-the argument `.fpy=my.module.foohandler' can be given to pass requests
-for `.fpy' files to the function `foohandler' in the module
-`my.module' (which must, of course, be importable). When writing such
-handler functions, you will probably want to use the getmod() function
-in this module.
+name of an object in that module, which should be a callable adhering
+to the WSGI specification. When called, this module will have made
+sure that the WSGI environment contains the SCRIPT_FILENAME parameter
+and that it is properly working. For example, the argument
+`.fpy=my.module.foohandler' can be given to pass requests for `.fpy'
+files to the function `foohandler' in the module `my.module' (which
+must, of course, be importable). When writing such handler functions,
+you will probably want to use the getmod() function in this module.