Poll Full Screen?? Poll Foreground Window. Page 13?? Poll Console Windows Only?? Poll Full Screen Poll the full screen (default). Low Accuracy Fast scan screen, some small changes can be missed. The Following 4 option are used used to. UltraVNC also has the MSRC4 plug-in which provides an RC4 bit stream cipher Pointei f7 Remove Desktop Wallpaper Update Handling r Poll Full Screen. CITRIX INTERVIEW QUESTIONS BANGALORE
Any positive integer is valid. Zero indicates that no debugging information should be produced and is the default. A value of around will cause full debugging output to be produced. Log data may be output to a file or a console window or the MSVC debugger if the program was compiled with debugging active.
For testing purposes, or, potentially, when using multiple instances of WinVNC on Windows Terminal Server, this behaviour is undesirable. In some cases, it is preferable to only for connections originating from the local machine and aimed at the "localhost" adapter - a particular example is the use of VNC over SSH to provide secure VNC.
Without the tray icon you can't make realtime changes. You need to edit the ultravnc. Settings take efect after winvnc restart. This behaviour is undesirable when the server machine is being used as a shared workstation by several users or when remoting a single display to multiple clients for viewing, as in a classroom situation.
This restriction was placed to ensure that misconfigured servers would not open security loopholes without the user realising. If a server is only to be used on a secure LAN, however, it may be desirable to forego such checking and allow machines to have a null password.
Otherwise, only watch, read only. Minimize bandwidt. Here's how to avoid having a customer launch the WinVNC server on his side, and then select "Add new client" to connect out to your VNC client running in listen mode put this in a batch file :. You have to turn off the "tight" protocol in your client or it will actually be slower trying to compress what's already compressed. We will install the server part, ie. If the host is hidden behind a firewall and uses a private IP address, thus making the host unaccessible directly, we will also add a client connection, ie.
A little-known feature is that VNC comes with a web server, which, once launched, gives you access to the user's host through a web browser, eg. If the drivee is located behind a firewall, VNC supports so-called listening mode, ie. Doesn't seem to allow the server to connect out, so customers must open their firewall and forward connections to the server you wish to manage.
By Marty: " I'd separate the firewall issue from the remote control issue by having the customer's machine instantiate an ssh connection to a server at Fog Creek, with a remote port forward. The server at Fog Creek just needs to run an ssh daemon, which is quite easy to set up. An example command line for ssh would be "ssh -R This forwards connections to port on installhelp. If you want to experiment with the tunnelling, I suggest you try putty and plink, both available at.
A user says: " I have used WebEx from the customer end, and I really was impressed. We have a firewall and there was no problem getting connected. Especially important to me is that I was in control of the process; the connection was initiated and broken from MY end. Joel answers: " I actually tried Webex and literally could not get the client to set up on my machine. Combined with the per-minute billing, I gave up on this idea, but I know many other people are using it happily.
It's expensive, but very, very good". However, in order to use the "session recording" feature of the java viewer, we would have to sign the java applet because it needs access to the local file system. Home Last modified: Remote Control applications Check-list Installing and running the server ie.
The server listens on either TCP standard mode , or TCP embedded Java web server, so the viewer can connect to out with a regular web browser The viewer, vncviewer. Once the two hosts are connected, the viewer can drive the server When used on a LAN, you can get higher performance by installing a video driver a.
Connection As explained, there are different ways to the server and viewer to be connected, depending on whether the server waits for incoming viewer connections, and whether there's a NAT router standing in front of the server and the viewer : The easiest solution is to launch the viewer in listening mode vncviewer -listen so that it waits for incoming server connections on TCP To connect out using the plain-vanilla server, use the following parameter when launching the server: -connect host[::port].
You can add the " -autoreconnect" switch in case of bad connections Note: -autoreconnect must come before the -connect switch. A more user-friendly solution is using Single Click , which doesn't require typing the viewer's IP or hostname Forwarding TCP to the server on the server's router so that the viewer can connect to the server in normal mode Repeater : Used when you need to view multiple servers on a remote LAN behind a firewall: One host there is running the repeater to which the viewer connects, and through which it can connect to other servers on the LAN.
More information. There are two modes available with the UltraVNC repeater: mode I Server and Viewer both in normal mode and mode II both server and viewer initiate an outgoing connection; Repeater has to run on a machine that can be accessed from server and viewer PC. The connection is established with a helper service NH, i. NAT helper located in the Internet. My Servers: In this folder you find the generated servers. The servers are saved in a sub folder with the same name as the viewer profile eg: creating a server called "Test" creates a sub-folder called "Test" and inside that sub-folder Repeater: This folder contains the Repeater.
An instance is most time running on the uvnc. Can be customized. What about WAN performance? Does it require being logged on as admin? Server and viewer on same host When distributing the server myself, what files do I need besides winvnc. How to launch the server and connect to a remote listening client automatically? Here's how to avoid having a customer launch the WinVNC server on his side, and then select "Add new client" to connect out to your VNC client running in listen mode put this in a batch file : winvnc -run rem VNC client running on host It is not firewall agnostic, but it works great in conjunction with Gotomypc.
We can Gotomypc into a server on the network, then VNC to other servers or workstations inside that network. Installing the managed host We will install the server part, ie. You can view the available switches using "vncviewer. VNC Reflector 1. Out of business? Users say: " Remote Admin is fast. It's very fast, and very versatile. We use it a fair bit on our pre 2k machines, and it works like a charm. You can also set it up to use Windows Authentication to decide who can access what, and can also run it though whichever port you wish.
It's shareware if I remember, and full licensing is dirt cheap. It's cheap, fast, and you can easily make shortcuts to remote control items which is a pain in Pcanywhere with the later versions requiring the remote control items in fixed folders. Everything in a remote control session has a keyboard shortcut CTRL-F12 is from heaven , and did I mention it's cheap? There have been increased port scans for RA's default port much like port scans for PCAnywhere's default port for years , so we change the default port on our network.
I'd recommend nTeras' RapidAssist. It solved our problems with reaching clients behind firewalls and proxies. It runs from their server or we can install it on our server and then runs through a browser. I have used it for over a year and it really works well.
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See How to configure Windows Server to display a message when users log on for details. Some advanced settings control the timing when simulating key presses to remotely logging in users. This value can be increased on slow computers to ensure that the username input field is ready.
This value specifies the number of milliseconds to wait between the individual simulated key presses. Increase this value if you encounter logon failures caused by missing characters or improperly switched input fields. The screen lock feature per default disables all input devices and hides parts of the operating system user interface.
This behaviour can be changed for cases where parts of the operating system user interface no longer function properly after a computer is unlocked. This option defines whether the taskbar and the start button should be disabled and hidden by the screen lock feature. This option defines whether the start menu should be disabled and hidden by the screen lock feature. This option defines whether the desktop should be disabled and hidden by the screen lock feature.
This option defines whether the Interception driver should be used. The Interception driver may cause troubles with RDP sessions and should therefore be disabled and uninstalled when using Veyon in remote desktop environments. If the driver is already installed, uninstallation is only possible after disabling this option and rebooting the computer. The driver can then be uninstalled using the uninstall. While the Veyon Server manages most UltraVNC settings on its own a few performance and system integration related settings can be changed manually.
In general you should not need to change the default values unless you encounter problems while accessing or controlling remote computers. When using the traditional screen mirroring driver i. This can result in large parts of the screen not being captured if the Windows Aero theme is used. To circumvent this issue capturing of semi-transparent windows is enabled per default.
Besides potentially lower performance this can also make the mouse cursor flicker on client computers. This option says whether to capture only the first of all monitors. On client computers it usually is desirable to see all monitors. On master computers this option can be disabled in order to broadcast only the contents of the first screen in demo mode. This way the teacher does not have to share its whole desktop. Broadcasting less screen data also improves performance.
This engine is a new driver backend for capturing screen data and provides much better performance compared to the traditional screen mirroring driver. Additionally it also captures windows with DirectX-rendered content, e. If no suitable driver for capturing screen data is found this determines whether to scan the whole screen for changed pixels.
Otherwise only the foreground window is scanned which can reduce CPU load. It should only be disabled as a last resort if CPU load is an issue. Enabling this option will make the VNC server use a scan raster to detect changed screen areas which need to be sent to the viewer. As changes of individual pixels might only be detected every 4th scan pass, partial updates can be delayed by a few hundred milliseconds in some cases.
In order to authenticate a user i. Any positive integer is valid. Zero indicates that no debugging information should be produced and is the default. A value of around will cause full debugging output to be produced. ConnectPriority By default, all WinVNC servers will disconnect any existing connections when an incoming, non-shared connection is authenticated. This behaviour is undesirable when the server machine is being used as a shared workstation by several users or when remoting a single display to multiple clients for vewing, as in a classroom situation.
WinVNC uses a special library, VNCHooks, to hook into the other running applications and retrieve notifications of areas of the screen being changed. The VNCHooks library uses the messages sent to visible Windows to decide which areas need considering for update. Not all applications use the same method of updating the screen, so you can tweak the method used by WinVNC for particular applications by editing the registry. All the entries listed can be found under.
The service support is still in the early stages of development, and the following 'features' should also be pointed out:. Windows NT 'features': There will be one password for the machine, rather than one per user.
The system tray icon is not always correctly displayed, so you won't always be able to tell whether someone else is connected except by the fact that things work more slowly. Windows 95 'features': Whether or not the VNC password is set per-machine or per-user depends on the settings in the Passwords section of the Control Panel.
If Win95 is set to use a different set of registry values for each user then when a user logs in, the password will change from the per-machine VNC password to that user's VNC password. If Win95 is set to use the same settings for all users then the per-machine VNC password will always be used.
General features for both Windows NT and Windows Anything which causes the Windows VNC server to change screen resolution will also cause all viewers to be disconnected, and you'll need to reconnect. When WinVNC is running as a system service, no user-level copies can be run at the same time.
Here's how to get it running as a service, assuming you've already installed it. Windows NT : You need to have administrator privileges on the local machine, so log on as administrator if your account doesn't have these. A dialog box will appear to indicate the success or failure of the operation. Open a command prompt and move into the directory into which you installed WinVNC, as described in part 2 above.
Use the -settings option to cause the service to display its Properties dialog. Access for all users will be controlled by the one machine-specific password. NOTE : Windows 95 : If Win95 has been set to use different settings for each user then the settings used are those of the currently logged in user.
If no user is logged in or Win95 is set to use the same settings for all users then the settings used are the Default user settings and are stored per-machine, rather than on a per-user basis as is done when running WinVNC normally. Under Win95, pressing Cancel on the login dialog gives access to the Default user settings. When you wish to install a new version of WinVNC or simply wish to remove WinVNC from your machine, you must first remove the service from the system, using the -remove option.
Open a command prompt and move into the directory into which you installed WinVNC. Use the -remove option, which will automatically stop the service and then remove it, and show a dialog box to indicate the success or failure of the operation. The full command-line options available are as follows for version R19 and later. You probably won't need anything other than those listed above unless you're a real VNC power-user! If no options are given then WinVNC runs normally. It also runs on NT5 beta.
Installation WinVNC is fairly simple to install and even easier to use. Update Handling Note that clicking in a window will generally cause it to be updated, so if you have certain applications which don't update very well, try this! However, this can cause graphical glitches occasionally, particularly when an application scrolls the contents of its window, in which case only the revealed section of the window is marked as needing to be updated.
A value of one indicates that this optimisation will be used, while a value of zero indicates that it will not. By default, timer messages are not used to notify WinVNC of potential updates, since many programs use timer events for purposes other than updating the screen. As a result, the clock and a few other applications don't normally update correctly under WinVNC. To fix this, WinVNC can scan the window every time a key is pressed, in order to catch the change.
A value of one indicates that key presses will cause updates, while a value of zero indicates that they will not. In order to catch such updates, it is necessary to trigger WinVNC to update the relevant window whenever the left mouse button is released. A value of one indicates that left-button clicks will cause updates, while a value of zero indicates that they will not. The same rules apply to the middle and right buttons using the appropriate value name.
As a result, sending an update message to WinVNC to indicate the potential change can result in WinVNC sending the updated area to the client before it has actually been redrawn by the application! This is a common problem, especially on multiprocessor versions of NT, so deferred updates are used by default. Deferred updates are handled by posting a custom message back into the window's own message queue rather than posting to WinVNC directly.
By the time this custom message is seen again by the VNCHooks library, the message that caused it will have been handled and the update can then be forwarded to WinVNC without danger of being handled prematurely. A few programs don't handle these extra messages in their queue very well, so this optimisation is optional.
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