The DG834 has a web interface for management, Netgear's own FAQ has help with retrieving that password if you've lost it. Once on there, you can get the basic settings which looks as follows:
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The password is starred out.
It's hidden using an HTML password field, which is meant to stop someone looking over your shoulder from seeing what password you type. However that is all it aims to protect against, it's then down to the individual web application as to whether it actually strips the password from the source code...and this Netgear doesn't.
You can use your browsers "view source" option (or "this frame" -> "view source") to read the PPPoA login from the HTML code:
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