I am using an HP Deksjet 3050 with the HP-LIP tool. I already described how to install an HP Printer, now I would like to show how to use that printer / MFD with the HP-LIP tools.
There are several ways to use the device. You can use the commandline, a web browser and the standard linux printing features. I will start with the command line.
Command Line features
You can see all the available commands:

You can find an overview and description on this website:
http://hplipopensource.com/hplip-web/tech_docs/man_pages/index.html
The command hp-scan allows you to directly scan from the command line.
The command hp-toolbox command starts a graphical user interface which allows you to see the status of your device, change settings, clean cartridges, etc.:

Web based Features
Another way to use your device is the web based user interface which is provided by the device itself. Open the IP Address of the device (in my case: http://192.168.178.29/) and you can see the following screen:
