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The NSL printer hp4050n.phys.nd.edu, located on the printer table in the front of the NSL Lab Control Room,
supports two-sided Black-and-White printing. If you print a black-and-white document in the lab, this should be your first choice.
In Windows XP, go to "Start". Select "Printers & Faxes". Under "Printer Tasks", select "Add a Printer".
The printer wizard box should appear:

Click on "Next". You'll get the Local or Printer Modal box:

Select "Local", and uncheck the Plug'n Play Check Box. Click "Next". You'll be asked which port to use:
Click the Radio button for "Create a New Port", and Select "Standard TCP/IP Port" from the list of port types.
Click "Next". You'll be asked to enter the port name:
Enter hp4050n.phys.nd.edu for both printer and port name. Select "Next". You might be asked to confirm your choice.
Eventually, you get to the Install Printer Software box:

Select "HP" for manufacturer, and "HP LaserJet 4050 Series PCL6" for the printer. Select "Next". You'll be asked to name the printer:

Name it what you like, then click "Next". Print a test page if you wish. Click "Finish"- You're done.
If you want to take advantage of the HP4050N's duplex capabilities, go to "Start". select "Printers & Faxes":

Select the HP4050N printer, Right-click, and select "Properties":

Go to the "Device Settings" tab. Under the Installable Options, click on the drop-down list box next to Duplex Unit.
Select "Installed". Click on OK. Duplex Printing is now Enabled.
When you print, you get the printer selection menu:
Choose the HP4050N, then click the "Preferences" button. You get the Preferences Menu:
Under the "Print on Both Sides" Menu Item, select the radio button corresponding to your printing choice.
The HP4050N printer is available on the lab's public Linux machines.
The interface for using two-sided printing differs between applications, depending on the UI library that was used.
There are two interfaces that seem to be common to the applications I've used:

Openoffice & many others use the above interface. Go to Page Setup, Two-sided, and select your desired option.

If you encounter an application using the interface above, select the printer, then select "Configure":

Checking or unchecking the Duplex checkbox enables/disables Two-sided printing.