VNC control Control computer Remote control VNC Controller Remote Control. In conclusion, VNC Viewer is a practical and quite simple to use application for OS X that makes it easy for you to connect to and control remove computers using your Mac. Chicken can be paired with various VNC servers including UltraVNC. The Chicken package does not include any VNC server functionality, nor does the client run on any other operating system than Mac OS X. Based on an older software package called Chicken of the VNC, Chicken is an open source VNC client for Mac OS X. The installer package contains both the VNC Viewer and the VNC Server and can be used to install just the viewer component. View the documentation for VNC® Enterprise 4.4 on Mac OS X. When you say you installed RealVNC, do you mean the RealVNC server? If so you have at least 2 VNC servers fighting for control of port 5900, unless you did something special to avoid that.