The process on IIS7 and earlier will be similar, the main difference being that the web site will run as a specific Windows user rather than an app pool identity. So you will need to add that user to your SQL Server, and create Windows permissions for it.
Ensure your page has the following code pasted near the bottom, before the closing 'body' tag.
Copy this code and place it where you want the help icon to appear in your page.
Your help link will appear as the icon below. Click it to verify how the help content will look.
Place a QR code on your product or machinery to let a user easily retrieve the user guide documentation for it.
Right-click and 'copy'