Most printing-related Registry settings reside in the following subkey
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print
An administrator can use the Registry Editor to assign read-only access to these subkeys. Users with read-only access cannot add or configure printers, because the read-only access does not allow changes of these subkeys.
Windows-based applications also use the following subkey in the Registry to find information about available printers.
HKEY_CURRENT_USER\Software\Microsoft\WindowsNT\ CurrentVersion\PrinterPorts
Users with read-only access to this subkey cannot add new printers that are recognized by Windows-based applications.