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That would load the new printer without needing a reboot
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This also works OK with "RUNDLL32 PRINTUI.DLL,PrintUIEntry /q /in /n\\server\printer" instead of the per computer options. I don't know which is better though.
One thing to note also, is that the share containing the drivers must be available for GUEST, or the drivers can't be copied. I think this is normally done by Windows, but Samba servers will need "guest = ok" in their print$ share entry.