Hi Bob,
The idea with the event handlers is not that they would be triggered from within the module, they would be triggered when a user registers or when a user edits his profile. You would just implement a class that inherits from UserRegisteredHandlerProvider and implement the override for UserRegisteredHandler, then you create an xml file that declares your handler and drop it in the /Setup/ProviderConfig/userregisteredhandlers folder. In the method you would do whatever you need to do to sync that user for YAF.
The article has example code you could copy and modify.
Currently we only have the plugin model for user registered but it would not be difficult for me to make similar plugin system for user profile changes.
This would be much more efficient than polling tables for changes.
Best,
Joe