Again, the dashed arrow indicates session initiation. The result resembles A VNC server includes an X server that can communicate with local X client programs. On Linux, the VNC server either mirrors the contents of the local X server’s screen to the remote computer or includes its own X server that can operate independently of the one that manages the local screen. With VNC, the user sits at the client computer and accesses a remote server computer.
#TURBO VNC FOR MAC MAC OS#
VNC is a cross-platform tool that can provide remote access to Linux, UNIX®, Mac OS X, Windows, and other systems from any type of client. For these and other reasons, many sites prefer to use another protocol, the Remote Frame Buffer (RFB), which is implemented in the Virtual Network Computing (VNC) family of programs. (SSH can tunnel X sessions, obviating this need.) Furthermore, although X servers are available for most platforms, they’re not routinely installed on computers running Windows®. For instance, this configuration requires two-way network protocol initiation, which might not be possible through some firewalls or network address translation (NAT) routers. This type of setup works fine on many local networks, but it has drawbacks. X remote access requires a client and a server on both computers (In the case of XDMCP, the XDMCP client is built into the X server program.) X remote access requires a client and a server on both computers depicts this relationship. The remote login server launches X clients that in turn contact the X server. The server for this login protocol runs on the X client computer, and the remote login client runs on the X server computer. This second protocol can be telnet, Secure Shell (SSH), or the X Display Manager Control Protocol (XDMCP). This configuration requires a second network protocol to initiate the connection. When X is used over a network, though, the user sits at the X server computer, and X’s clients are the programs that the user wants to run on another computer. Thus, LibreOffice, the GNU Image Manipulation Program (GIMP), or other programs are X clients that use X’s network protocols to accept user input and display output for users on the same computer. In the most common configuration, the X client programs run on the same computer as the server. The oddity is that the “local resources” in the case of an X server are the display, keyboard, and mouse, which the user uses.
Network server programs give client programs access to local resources, and this is true of an X server, as well. An X server is literally a network server program. X is an unusual GUI in several ways, one way being that it’s inherently network enabled. Linux® uses the X Window System ( X for short) as its graphical user interface (GUI).
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