How to implement the documentation help function for webdynpro application

We have implemented SAP Travelmanagement ESS services which uses ABAP Webdynpro. In each of the screen there is a "help" link on the top right corner. I would like to know how to use this function to link a help file that explains what needs to be done on each screen.

My requirement is to provide screen specific help information as a document for each of the screen in my webdynpro application.

Any suggestions, options, samples from the experts would be most appreciated.

Regards

Vivek