About creating custom Help
There are several ways to add custom Help to a Microsoft Access form, report, or control.
Display tips for controls and toolbar buttons
You can display tips that appear over controls when the user moves the mouse pointer over the control. You can also create tips for new toolbar buttons that you create.
Display text in the status bar
You can display helpful information about a form or control in the status bar.
Display custom Help
You can display more extensive Help by creating a Help file and displaying it when the user presses F1 or clicks the What's This button 
on the Form window.
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For forms and reports, you can display Help when the user presses F1. You can also display Help for a control that has focus.
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For forms and controls, you can display Help when the user clicks the What's This button and then clicks the background of the form or a control.
You create the Help file by using a program that can save documents in Rich Text Format, such as Microsoft Help Workshop, or in HTML format, such as Microsoft HTML Help Workshop.
Note You can download Microsoft Help Workshop from the MSDN Web site.