HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3
DisableTrayIcon: Setting this entry to 1 remove the tray icon
There is an error in the documentation, key
HKEY_LOCAL_MACHINE\Software\ORL does not exist
HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3 is the correct.
Sample
[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3]
"DebugMode"=dword:00000002
"DebugLevel"=dword:0000000a
"AllowLoopback"=dword:00000001
"MSLogonRequired"=dword:00000000
"UseDSMPlugin"=dword:00000000
"DisableTrayIcon"=dword:00000001