To forward a print job to a different Windows NT print server, a Windows NT print server uses a null session. By default, the null session is disabled, preventing job forwarding. To enable job forwarding and null-session support, manually edit the following Registry subkey:
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ LanmanServer\Parameters
In this subkey is a value named NullSessionShares. Add a new line containing the share name for the printer. This change does not take effect until you stop and restart the Spooler service.