https://blog.wongcw.com/2020/01/20/vnc-server-v6-7-0vnc-viewer-v6-20-113-%e8%a8%bb%e5%86%8a%e7%89%88%e9%99%84key-vnc%e9%81%a0%e7%a8%8b%e6%8e%a7%e5%88%b6%e8%bb%9f%e4%bb%b6/