Finally found the article. See http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/581.mspx , which deals with the "Prevent users from installing printer drivers" security policy.
Quote:
For a computer to print to a network printer, the driver for that network printer must be installed on the local computer. This security setting determines who is allowed to install a printer driver as part of adding a network printer. If this setting is enabled, only Administrators and Power Users can install a printer driver as part of adding a network printer. If this setting is disabled, any user can install a printer driver as part of adding a network printer. This setting can be used to prevent unprivileged users from downloading and installing an untrusted printer driver.
If an administrator has configured a trusted path for downloading drivers, this setting has no impact. When trusted paths are used, the print subsystem attempts to use the trusted path to download the driver. If the trusted path download succeeds, the driver is installed on behalf of any user. If the trusted path download fails, the driver is not installed and the network printer cannot be added.
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