The cvc virtual console driver is a STREAMS-based pseudo driver that supports the network console. The cvc driver interfaces with console(7D).
Logically, the cvc driver sits below the console driver. It redirects console output to the cvcredir(7D) driver if a network console connection is active. If a network console connection is not active, it redirects console output to an internal hardware interface.
The cvc driver receives console input from cvcredir and internal hardware and passes it to the process associated with /dev/console.