you are talking about context sensitive help, and yes, it is
entirely possible. there is decent info on CSH in the Help for RH,
and both you and your developers should review the process.
When you set up CSH, the Help button on any window in your
application can open a Help topic that you write to address the
specific fields and functions on that window.
Reply back if you have more specific questions that aren't
addressed by the Help materials.
Good luck!