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TightVNC is a free and open-source remote desktop software server and client application for Linux and Windows.A server for macOS is available under a commercial source code license only, without SDK or binary version provided. [3]
UltraVNC is the result of the merger of Vdacc-VNC started by Rudi De Vos in 1999 and eSVNC started by Sam in 2002. [1] UltraVNC is developed in the C, C++, and Java programming languages. Since release 1.0.6.4, UltraVNC server can work as a Windows service under User Account Control (UAC).
RFB ("remote framebuffer") is an open simple protocol for remote access to graphical user interfaces.Because it works at the framebuffer level it is applicable to all windowing systems and applications, including Microsoft Windows, macOS, the X Window System and Wayland.
The server site does not have to configure its firewall/NAT to allow access on a defined port; the onus is on the viewer, which is useful if the server site has no computer expertise, while the viewer user would be expected to be more knowledgeable.
RealVNC clients using vncviewer can run in full-screen mode; they use the F8 function-key as the default key for bringing up an options menu (which includes the option to, among other things, switch off full screen mode or to forward a Control-Alt-Delete key-sequence).
x11vnc keeps a copy of the X server's frame buffer in RAM.The X11 programming interface XShmGetImage is used to retrieve the frame buffer pixel data. x11vnc compares the X server's frame buffer against its copy to see which pixel regions have changed (and hence need to be sent to the VNC viewers.)
The VNC server is the program on the machine that shares some screen (and may not be related to a physical display: the server can be "headless"), and allows the client to share control of it. The VNC client (or viewer) is the program that represents the screen data originating from the server, receives updates from it, and presumably controls ...
Remmina is a free and open source remote desktop client for POSIX-based computer operating systems. It supports the Remote Desktop Protocol (RDP), VNC, NX, XDMCP, SPICE, X2Go and SSH protocols and uses FreeRDP as foundation. [4] [5]