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RFB (protocol)
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. RFB is the protocol used in Virtual Network Computing (VNC) and its derivatives. Description By default, a viewer/client uses TCP port 5900 to connect to a server (or 5800 for browser access), but can also be set to use any other port. Alternatively, a server can connect to a viewer in "listening mode" (by default on port 5500). One advantage of listening mode is that the server site does not have to configure its firewall/NAT to allow access on the specified ports; the burden 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. Although RFB started as a relatively simple protocol, it has been enhanced with additional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Protocol
A communication protocol is a system of rules that allows two or more entities of a communications system to transmit information via any variation of a physical quantity. The protocol defines the rules, syntax, semantics (computer science), semantics, and synchronization of communication and possible Error detection and correction, error recovery methods. Protocols may be implemented by Computer hardware, hardware, software, or a combination of both. Communicating systems use well-defined formats for exchanging various messages. Each message has an exact meaning intended to elicit a response from a range of possible responses predetermined for that particular situation. The specified behavior is typically independent of how it is to be Implementation, implemented. Communication protocols have to be agreed upon by the parties involved. To reach an agreement, a protocol may be developed into a technical standard. A programming language describes the same for computations, so there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealVNC
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. The application is used, for example, by IT support engineers to provide helpdesk services to remote users. History Andy Harter and other members of the original VNC team at AT&T founded RealVNC Limited in 2002. The automotive division of RealVNC spun out as a separate companyVNC Automotive in 2018. Platforms, editions, versions For a desktop-to-desktop connection RealVNC runs on Windows, macOS, and many Unix-like operating systems. A list of supported platforms can be found on thwebsite A RealVNC client also runs on the Java platform and on the Apple iPhone, iPod touch and iPad and Google Google LLC (, ) is an American multinational corporation and technology company focusing on online advertising, search engin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SPICE (protocol)
In computing, SPICE (the Simple Protocol for Independent Computing Environments) is a remote- display system built for virtual environments which allows users to view a computing "desktop" environment – not only on its computer-server machine, but also from anywhere on the Internet – using a wide variety of machine architectures. Qumranet originally developed SPICE using a closed-source codebase in 2007. Red Hat, Inc acquired Qumranet in 2008, and in December 2009 released the code under an open-source license and made the protocol an open standard. Security A SPICE client connection to a remote desktop server consists of multiple data channels, each of which is run over a separate TCP or UNIX socket connection. A data channel can be designated to operate in either clear-text, or TLS modes, allowing the administrator to trade off the security level vs performance. The TLS mode provides strong encryption of all traffic transmitted on the data channel. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xpra
xpra, abbreviated from X Persistent Remote Applications, is a set of software utilities that run X clients, typically on a remote host, and direct their display to the local machine without the X clients closing or losing any state in case the network connection between the local machine and the remote host is lost. Xpra differs from standard ''X forwarding'' primarily in allowing disconnection and reconnection without disrupting the forwarded application. It also differs from VNC and similar remote display technologies in being ''rootless'', so applications forwarded by Xpra appear on the local desktop as normal windows managed by the local window manager, rather than being all "trapped in a box together". Xpra also uses a custom protocol that is self-tuning and relatively latency-insensitive, and thus is usable over worse links than standard X. The original inspiration for making Xpra came from the original author's experience of attempting to use various setups based on N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NX Technology
NX technology, commonly known as ''NX'' or NoMachine, is a remote access and remote control computer software allowing remote desktop access and maintenance of computers. It is developed by the Luxembourg-based company NoMachine S.à r.l. NoMachine is proprietary software and is free-of-charge for non-commercial use. History NX's design was derived from the Differential X Protocol Compressor project (DXPC). In 2003, NoMachine's compression and transport protocol NX was created to improve the performance of the native X display protocol so it could be used over slow connections such as dial-up modems. Originally targeting Linux-based operating systems, the core compression technology, designed by Gian Filippo Pinzari and announced on the KDE and Gnome development forums, was released under the GNU GPL2 license (NX 1) for Linux servers in 2003, whilst other components such as the NX Server and NX Client programs remained proprietary software. A number of spinoffs of the NX t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Remote Desktop Software
This page is a comparison of notable remote desktop software available for various platforms. Remote desktop software Operating system support Features Terminology In the table above, the following terminology is intended to be used to describe some important features: *Listening mode: where a server connects to a viewer. 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. *Built-in encryption: the software has at least one method of encrypting the data between the local and remote computers, and the encryption mechanism is built into the remote control software. *File transfer: the software allows the user to transfer files between the local and remote computers, from within the client software's user interface. *Audio support: the remote control software transfers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Character
A bell character (sometimes bell code) is a device control code originally sent to ring a small electromechanical bell on tickers and other teleprinters and teletypewriters to alert operators at the other end of the line, often of an incoming message. Though tickers punched the bell codes into their tapes, printers generally do not print a character when the bell code is received. Bell codes are usually represented by the label "BEL". They have been used since 1870 (initially in the Baudot code). To maintain backward compatibility, video display terminals (VDTs) that replaced teletypewriters included speakers or buzzers to perform the same function, as did the personal computers that followed. Modern terminal emulators often integrate the warnings to the desktop environment (e.g., the macOS Terminal will play the system warning sound) and also often offer a silent ''visual bell'' feature that flashes the terminal window briefly. Representations In ASCII the bell characte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Remote Desktop Protocol
Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft Corporation which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software. Several clients exist for most versions of Microsoft Windows (including Windows Mobile but the support has ended), Linux (for example Remmina), Unix, macOS, iOS, Android, and other operating systems. RDP servers are built into the server and professional editions of Windows operating systems but not home editions; an RDP server for Unix and OS X also exists (for example xrdp). By default, the server listens on TCP port 3389 Microsoft KB article 306759, revision 2.2. and UDP port 3389. Microsoft currently refers to their official RDP client software as Remote Desktop Connection, formerly "Terminal Services Client". The protocol is an extension of the ITU-T T.128 applic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UTF-8
UTF-8 is a character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from ''Unicode Transformation Format 8-bit''. Almost every webpage is transmitted as UTF-8. UTF-8 supports all 1,112,064 valid Unicode code points using a variable-width encoding of one to four one- byte (8-bit) code units. Code points with lower numerical values, which tend to occur more frequently, are encoded using fewer bytes. It was designed for backward compatibility with ASCII: the first 128 characters of Unicode, which correspond one-to-one with ASCII, are encoded using a single byte with the same binary value as ASCII, so that a UTF-8-encoded file using only those characters is identical to an ASCII file. Most software designed for any extended ASCII can read and write UTF-8, and this results in fewer internationalization issues than any alternative text encoding. UTF-8 is dominant for all countries/languages on the internet, with 99% global ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TurboVNC
VirtualGL (VGL) is an open-source software, open-source software package that redirects the 3D rendering commands from Unix and Linux OpenGL applications to 3D accelerator hardware in a dedicated server and sends the rendered output to a (thin client, thin) client located elsewhere on the network. On the server side, VirtualGL consists of a library that handles the redirection and a wrapper program that instructs applications to use this library. Clients can connect to the server either using a X Window System protocols and architecture, remote X11 connection or using an X11 proxy such as a Virtual Network Computing (VNC) server. In case of an X11 connection some client-side VirtualGL software is also needed to receive the rendered graphics output separately from the X11 stream. In case of a VNC connection no specific client-side software is needed other than the VNC client itself. Problem The performance of OpenGL applications can be greatly improved by rendering the graphics on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portable Network Graphics
Portable Network Graphics (PNG, officially pronounced , colloquially pronounced ) is a raster graphics, raster-graphics file graphics file format, format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF). PNG supports palette-based images (with palettes of 24-bit RGB color model, RGB or 32-bit RGBA color space, RGBA colors), grayscale images (with or without an Alpha compositing, alpha channel for transparency), and full-color non-palette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics; therefore, non-RGB color spaces such as CMYK color model, CMYK are not supported. A PNG file contains a single image in an extensible structure of ''chunks'', encoding the basic pixels and other information such as textual comments and Integrity checker, integrity checks documented in Request for Comments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TigerVNC
TigerVNC is an open source Virtual Network Computing (VNC) server and client software, started as a fork of TightVNC in 2009. The client supports Windows, Linux and macOS. The server supports Linux. There is no server for macOS and as of release 1.11.0 the Windows server is no longer maintained. History Red Hat, Cendio AB, and TurboVNC maintainers started this fork because RealVNC had focused on their enterprise non-open VNC and no TightVNC update had appeared since 2006. The past few years however, Cendio AB who use it for their product ThinLinc is the main contributor to the project. TigerVNC is fully open-source, with development and discussion done via publicly accessible mailing lists and repositories. TigerVNC has a different feature set than TightVNC, despite its origins. For example, TigerVNC adds encryption for all supported operating systems and not just Linux. Conversely, TightVNC has features that TigerVNC doesn't have, such as file transfers. TigerVNC focuses on p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
