Remote desktop software
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In computing, the term remote desktop refers to a software or operating system feature that allows a personal computer's desktop environment to be run remotely on one system (usually a PC, but the concept applies equally to a server), while being displayed on a separate client device. Remote desktop applications have varying features. Some allow attaching to an existing user's session (i.e., a running desktop) and "remote controlling", either displaying the remote control session or blanking the screen. Taking over a desktop remotely is a form of remote administration.
Remote access can also be explained as remote control of a computer by using another device connected via the internet or another network. This is widely used by many computer manufacturers and large businesses' help desks for technical troubleshooting of their customers' problems. There are various professional first-party, third-party, open source, and freeware remote desktop applications, some of which are cross-platform across various versions of Windows, Mac OS X, UNIX, and Linux.
How it works
Remote desktop virtualization implementations operate as client/server computing environments. The controlling computer (referred to in this context as the client) displays a copy of the image received from the controlled computer's (in this context the server) display screen. The copy is updated on a timed interval, or when a change on screen is noticed by the remote control software. The software on the controlling computer transmits its own keyboard and mouse activity to the controlled computer, where the remote control software implements these actions. The controlled computer then behaves as if the actions were performed directly at that computer. In many cases the local display and input devices can be disabled so that the remote session cannot be viewed or interfered with.
The quality, speed and functions of any remote desktop protocol are based on the system layer where the graphical desktop is redirected and the efficiency of the remote display protocol. Software such as VNC and others use the top software layer to extract and compress the graphic interface images for transmission. Other implementations such as Microsoft's RDP use a kernel driver level to construct the remote desktop for transmission of data. مبنبنور
A main use of remote desktop software is remote administration. It can also be used for "headless computers": instead of each computer having its own monitor, keyboard, and mouse, or using a KVM switch, a monitor, keyboard and mouse can be attached to one computer with remote control software, and headless computers controlled by it. The duplicate desktop mode is useful for user support and education. Remote control software combined with telephone communication can be nearly as helpful for novice computer-users as if the support staff were actually there.
Since the advent of cloud computing remote desktop software can be housed on USB hardware devices, allowing users to connect the device to any PC connected to their network or the Internet and recreate their desktop via a connection to the cloud. This model avoids one problem with remote desktop software, which requires the local computer to be switched on at the time when the user wishes to access it remotely. (It is possible with a router with C2S VPN support, and Wake on LAN equipment, to establish a virtual private network (VPN) connection with the router over the Internet if not connected to the LAN, switch on a computer connected to the router, then connect to it.)
Remote desktop products
These are available in three models: hosted service, software, and appliance.
Remote desktop protocols
The main remote desktop protocols in use are:
- Apple Remote Desktop Protocol (ARD) - Original protocol for Apple Remote Desktop on Mac OS X machines.
- Appliance Link Protocol (ALP) - a Sun Microsystems-specific protocol featuring audio (play and record), remote printing, remote USB, accelerated video
- Independent Computing Architecture (ICA) - a proprietary protocol designed by Citrix Systems
- NX technology (NX) - handles remote X Window System connections.
- PC-over-IP (PCoIP) - a proprietary protocol used by VMware (licensed from Teradici)
- Remote Desktop Protocol (RDP) - a Windows-specific protocol featuring audio and remote printing
- Remote Frame Buffer Protocol (RFB) - A framebuffer level cross-platform protocol that VNC is based on.
- SPICE (Simple Protocol for Independent Computing Environments) – remote-display system built for virtual environments by Qumranet, now Red Hat
- Splashtop - a high performance remote desktop protocol developed by Splashtop, fully optimized for hardware (H.264) including Intel / AMD chipsets, NVIDIA / ATI GPU & APU, Qualcomm Snapdragon, and NVIDIA Tegra. By optimizing for different profiles of media codecs, Splashtop can deliver high frame rates with low latency, and also low power consumption.
- Virtual Network Computing (VNC) - a cross-platform protocol
- X Window System (X11) - a well-established cross-platform protocol mainly used for displaying local applications; X11 has not been network transparent for a long time now, but it is network capable
- Comparison of remote desktop software
- Comparison of Java Remote Desktop projects
- Desktop virtualization
- Remote computer
- "VMware Announces Strategic Licensing and Co-development Agreement with Teradici for True Remote PC User Experience Further Bolstering its vClient Initiative". VMware News Releases. VMware. Retrieved 1 June 2013.
- Stone, Daniel (2013-01-28). "The real story behind Wayland and X11 linux.conf.au".