Generally, the services that the data-link layer of the Open Systems Interconnection (OSI) reference model provides to adjacent layers of the OSI protocol stack. Specifically, a Data Link Control (DLC) is a specialized network protocol that is used primarily for two purposes:
DLC is not used as a network protocol in the usual sense of enabling communication among computers on the network. It is not used by the redirector in the Microsoft Windows NT and Windows 2000 operating systems and so cannot be used for session-level communication over a network. DLC is not routable; it is designed only to give devices direct access to the data-link layer.
DLC is supported by most Windows operating systems, including Windows 95, Windows 98, Windows NT, and Windows 2000. Windows 95 OSR2 includes both a 16-bit and a 32-bit version of DLC.
To use DLC on Windows NT or Windows 2000 to connect to a Hewlett-Packard network print device, perform the following steps: