what type of helppage are u looking for ?
field level , screen level or consolidated ?
if u are looking for
1) consolidated help . just make some big pdf document or html document or use any external tool and call that file along with executable from the button
2) screen level - just make html files with the same name as form name and call this html from when button_pressed event . reason behind keeping the html name as form name is u don't need to hard code the html file name . just pass formname parameter to teh function u use . concatenated with .html
3) field level - i don't kno wmuch but u can use object properties , hint option ( it just displays text when pointer moves over the object ) no coding required for this .