This function returns the symbol TRUE if there is another message-handler available for execution, FALSE otherwise. If this function is called from an handler and there are any ed handlers (see section 9.5.3), the return value is the symbol TRUE. If this function is called from a primary handler and there are any shadowed primary handlers, the return value is the symbol TRUE. In any other circumstance, the return value is the symbol FALSE.
Syntax
(next-handlerp)