Some help requests amount to an explicit request for specific information, such as help on "version" (which usually displays the copyright topic). Other help requests, however, may require some degree of context sensitivity. That is, some processing might be needed to determine the appropriate help topic based on the user's current context within the application.
For instance, your application might test the status of certain modes or settings to determine the appropriate help topic. Or, it might test the value of an input field and provide detailed help if the value is not valid, and general help if the value is valid.