How to utilize those Market QR codes? Once in a while I see a description of a program that is to be installed via Android market. It is often accompanied by a two-dimensional barcode looking like a QR code that I guess somehow contains a link to the right Market page and the process of using it should be very easy.

I've searched and the closest thing I found is this question about reading QR Codes which makes me think it shouldn't be that hard and so I can't see whether that question is about the same usecase I'm asking about.

How exactly to make use of such barcodes? What's the way to proceed from the QR code on a web page to Market page?
I have installed the application "Barcode Scanner" from here https://market.android.com/details?id=com.google.zxing.client.android 

To install an application, I open the "Barcode Scanner" application and hold the phone up to the barcode. It scans and decodes it automatically and then gives me the option to "open brower". I click on that and it eventually leads me to the Android market when I am given the option to install the application.