Setting this registry entry to 1 will cause local-loopback connections to be allowed. Setting it to zero will filter out such connections. DebugLevel DebugMode Run-time logging of all internal debug messages is now supported. Any combination of the above values may be used. DebugLevel indicates how much debug information to present.
Any positive integer is valid.
Zero indicates that no debugging information should be produced and is the default. A value of around 10-12 will cause full debugging output to be produced. By default, all WinVNC servers will disconnect any existing connections when an incoming, non-shared connection is authenticated. This behaviour is undesirable when the server machine is being used as a shared workstation by several users or when remoting a single display to multiple clients for vewing, as in a classroom situation. VNCHooks - Advanced Settings WinVNC uses a special library, VNCHooks, to hook into the other running applications and retrieve notifications of areas of the screen being changed.