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The initial versions of the XRDP project relied on a local VNC server installation that had to be present alongside the program, in order to relay the graphics and controls between the user and the server [7] (known as the "VNC forwarding mode"). However, this mode is currently not recommended to use anymore, due to its slow performance.
When creating the RFB frame buffer in this mode, x11vnc allocates a very large scratch region below the top portion used for the actual (on-screen) pixel data. x11vnc can then use the RFB CopyRect command to instruct the viewer to move rectangles of pixel data into and out of the scratch region. These moves are done locally on the viewer side.
Remote assistance: remote and local users are able to view the same screen at the same time, so a remote user can assist a local user. Access permission request: local user should approve a remote access session start. NAT passthrough: the ability to connect to the server behind a NAT without configuring the router's port forwarding rules. It ...
In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without showing any screen output. From the point of view of the X client app, it acts exactly like any other X display server, serving requests and sending events and errors as appropriate. However, no output is shown.
Wayland is a communication protocol that specifies the communication between a display server and its clients, as well as a C library implementation of that protocol. [9] A display server using the Wayland protocol is called a Wayland compositor, because it additionally performs the task of a compositing window manager.
The format of the message varies from version to version: [18] 10.0–10.1: The system displays text on the screen, giving details about the error, and becomes unresponsive. 10.2: Rolls down a black transparent curtain then displays a message on a white background informing the user that they should restart the computer.
Alternatively, a machine (which may be a workstation or a network server) with screen, keyboard, and mouse can be set up to boot and run the VNC server as a service or daemon, then the screen, keyboard, and mouse can be removed and the machine stored in an out-of-the way location. Users commonly deploy VNC as a cross-platform remote desktop system.
Workarounds like x11vnc (VNC :0 viewers), Xpra's shadow mode and NX's nxagent shadow mode also exist to make the current X-server screen available. This ability allows the user interface (mouse, keyboard, monitor) of a running application to be switched from one location to another without stopping and restarting the application.