Siemens SINUMERIK 840D sl Commissioning Manual page 230

Glossary
VNC (Virtual Network Computing)
Virtual Network Computing is a software that displays the screen contents of a remote
computer, with a running VNC server, on a local computer, with a running VNC viewer, and
in return sends keyboard and mouse movements of the local computer to the remote
computer.
Reference: Operator Components and Networking Manual
48
NCU Operating System (IM7)
Commissioning Manual, 07/2007, 6FC5397-1DP10-2BA0