Thanks, everyone, for the suggestions.
I should have explained in more detail. When you, as the Administrator, install a network printer on a Windows XP Pro PC, the only user that will be able to see the new network printer is the Administrator. All other users (dozens of students, in our case) who have logged into that XP PC in the past, or who log into it the future, will not see the new printer because it only exists in the Administrator's user account.
In order to make the network printer visible to all users, we have been installing the printer in a test user account, then copying the test user account over as the Default User account.
All new users who subsequently log into the PC for the first time will be able to see the new printer. Their new user account is created by XP from the new Default User account, which includes the new printer.
However, any "old" user who logged into the PC (before the new network printer was added to the Default User account) will not see the new printer. Their user account -- which already exists on the PC and was originally created from the old Default User account -- does not include the newly installed printer.
To let "old" users see the new printer, you must delete all of their old user accounts on each PC before they log in again. Multiply this chore by dozens of PCs, and this takes a very long time. We are thus looking for a way to quickly install a network printer so it will be visible to all existing user accounts on each PC, without deleting their user accounts first.
Actually, I have found some possible solutions since my original post.
One involves installing the printer as a local printer (to the PC's LPT1 port), then changing the port path to that of the network printer. Note the problem described by "Manoj" in the following Windows Annoyances forum, and the answer posted by "dneeley":
Annoyances.Org
Network Printer Problem
Thread #1022569264
http://www.annoyances.org/exec/forum/win2000/t1022569264
There is also a command line method (using "rundll32 printui.dll,PrintUIEntry") for installing printers. Note the posts by "Brian Sanderson" in the following newsgroup search:
Google Groups
http://groups.google.com/groups?sourceid=navclient&q=%22bruce+sanderson%22+%22rundll32+printui%2Edll%2CPrintUIEntry%22
These sound promising.
Pete