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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.)
RealVNC is a company that provides remote access software. Their VNC Connect software consists of a server (VNC Server) and client (VNC Viewer) application, which exchange data over the RFB protocol to allow the Viewer to control the Server's screen remotely.
Vino was a VNC server for the GNOME desktop environment, the GNOME developers now recommend using "gnome-remote-desktop" instead. Configuration up to version 3.8.0 was via the vino-preferences program. This was removed from the packages after that version, since the gnome-control-center could then be used alternatively to control settings.
In Unix and other POSIX-compatible systems, the parent process can retrieve the exit status of a child process using the wait() family of system calls defined in wait.h. [10] Of these, the waitid() [11] call retrieves the full exit status, but the older wait() and waitpid() [12] calls retrieve only the least significant 8 bits of the exit status.
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 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 ...
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 allows the use of a remote computer as if the user were in front of it. This is achieved by sending mouse movements and key-presses to the remote computer, and replicating the remote computer's display (subject to differences in resolution) locally in real time.