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remote access inside a lan

Hello,

over the internet, I am using tools such as Ultra-VNC or Teamviewer, to give remote support and to make online product presentations.

If I have given 4 PCs (1 server and 3 clients, Windows XP or W 7) in a LAN (not connected to the internet), and I start one vc++-application program on the server:
How can I look at the vc++-application from the 3 clients ? Would teamviewer be a good solution, or would it not work ? Or is there any better solution ?

The vc++ application can not run in a network, in the sense of: if the user on PC 1 selects record A, then the user on PC 2 cannot work on the same database simutaneously, selecting another record B.

The window of the vc++ application should always be visible from all 4 pcs, and to switch the work from pc X to pc Y should not require any login.

The whole idea is a short term solution around the non network capability of my vc++ application.
Since the vc++ application is not used permanently by all 4 users, this "remote" access solution is acceptable.

Can anyone guide me to the solution ? Any comments are apprechiated.

Sonja
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Sonja_M
Asked:
Sonja_M
5 Solutions
 
dee_nzCommented:
Try using UltraVNC http://www.uvnc.com (it’s free)
You could install this on the server running the VC++ application and select the multi viewer connections option to keep existing connections.
Then install UltraVNC on your client PCs as well. Users could then use VNC viewer to connect to the server. All 3 clients could connect to the server at the same time and see the same desktop/screen.  
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OOsorioCommented:
Team Viewer has a downloadable Host module for unatended access to PC's, be it over the internet or on the same lan. On the lan you would enter the IP address of the host.
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Sonja_MAuthor Commented:
Hello dee_nz, hello OOsorio,

thank you for your solutions. Now I need time to test them.

Best regards, Sonja
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Sonja_MAuthor Commented:
Hello,

I started to try ultra-VNC. On my small test network (just 2 PCs, both W XP, twisted cable) I get an error "no connection".

Let us analyse the whole thing with the screenshots: first the screenshots from the server side pc:
1.)  physical level: the server sees when the cable is unplugged2.)  from my point of view, the PINGs are perfect.3.)  I took the default settings almost everywhere except of what is red (to allow multiple viewers).4.)  how should I connect to the viewers ? Do I need to INSTALL WinVNC Service ? - Is Alle-Programme\UltraVNC\UltraVNC server the same as Alle-Programme\UltraVNC\UltraVNC Server\Start WinVNC service ?5.)  I hope this file proofs the server is running fine. - I wonder why here 2 passwords are needed, but I have found no other place where these passwords are used.These were the screenshots from the server, in the following post you get the screens from the viewer...
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Sonja_MAuthor Commented:
...and now the screenshots from the viewer side:
1V.)  Hardware level: The viewers PC sees when the network cable is unplugged.2V.)  from my point of view, the PINGs seem ok.3V.)  one folder is shared in the network, and I can see and change the content of that folder from both PCs.4V.)  I took the default options and pressed CONNECT. I wonder why the password as entered in the SERVER PC is needed nowhere.5V.)  why ?
So what did I make wrong ?

Best regards, Sonja
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SteveJCommented:
Hello Sonja_M . . .sorry you are having trouble. From the screenshot above, it looks as though you did not supply the IP address for the VNC server. The status box shows Server=5900 and Port=5900

Look at 4.V) View Connection Options . . . In the "VNC Server" box you need to put "192.168.0.77:5900" (assuming 192.168.0.77 is the VNC server).

Good luck,
SteveJ



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Sonja_MAuthor Commented:
Hello SteveJ,

this was a big step forward ! Now I can make it run, but still do not understand a few things:
1.) what is the difference between
entering 192.168.0.77:5900  and
entering 192.168.0.77::5900 ?

2.) On the server, I get the following windows:

 different passwords: what is what ?I see I can login from the client using the passwords as on the right side, but what are the passwords from the left side good for ?

3.) on the server PC, a right click on the icon gives the following image:
 what is what ?What is the meaning of the terms CLIENT versus SERVICE versus CONNECTION ?
In other words: what I am actually looking for is: all PCs in the lan should automatically make a VNC connection to the vnc server PC, as long as the PC is running. Better no passwords. Also the VNC VIEWER is quite complex, for the end user. Better not give him the possibility to change the settings. How to achieve this ?

Best regards, Sonja
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SteveJCommented:
CLIENT refers to the VNC viewer software . . .  SERVICE refers to Windows Services and the fact that VNC server can be installed as a service and started automatically whenever Windows is started. CONNECTION simply refers to CLIENT with an established CONNECTION to a server.

Restricting a user from access to options requires changing Windows Registry Settings and those settings depend on the version and actual type of VNC product (Real VNC, TIghtVNC, UltraVNC, etc).

The problem with not setting a password, particularly if you are accessing a remote PC over the internet, is that anyone could in theory connect to your VNC server. Of course, you will have to set the firewall up to allow inbound connections to the VNC server and you could remap the PORT to obscure the VNC server . . . you should password protect (with a complex password) the PC that is accessible from the internet.

To accomplish what you described in your question ** I THINK ** you will have to install a VNC server on each of the "client" stations. This would allow you to remotely take control of the "client". Then from the client you could launch a VNC -- or for that matter, an RDC -- connection to the vc++ server.

Good luck,
SteveJ
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Sonja_MAuthor Commented:
Hello all,

> Restricting a user from access to options requires changing Windows
> Registry Settings and those settings depend on the version and actual
> type of VNC product (Real VNC, TIghtVNC, UltraVNC, etc).
that is a misunderstanding of the requirements. If the user really wants to change the options, fine with me. But those users who do not want to change it need a fool proofed user interface, which is just one icon or button "<connect now!>".
Now I use www.uvnc.com,as proposed by dee_nz.

> To accomplish what you described in your question ** I THINK ** you will
> have to install a VNC server on each of the "client" stations.
I made now a test with 3 PCs: one with a vnc server and 2 with a vnc viewer. Both viewers see what is going on at the server, and both viewers can enter commands with mouse/keyboard.

Does anyone know about question 1 and 2 from my last comment ?

yours, Sonja
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SteveJCommented:
1. Difference between . . . that's IPv4 and IPv6 notation. Double colon (::) is IPv6 port distinguisher

2. "VNC Password" to allow control of the machine, "VNC viewer password" only allows "viewing"

Your question was:

<<Also the VNC VIEWER is quite complex, for the end user. Better not give him the possibility to change the settings. How to achieve this ?>>

I replied that you would have to change the windows registry settings. The registry settings for VNC after it has been installed on a machine include values for disallowing changes to the configuration. Im not sure how that's a misunderstanding of the requirement.

Are you now asking how to create a desktop icon that starts VNC without the option to change settings? VNC isnt really a user customizable program. There are things you can do with the registry as I said, but it wasn't written to allow easy modifications to the user interface.

Good luck,
SteveJ
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Sonja_MAuthor Commented:
Hello,

I see 4 passwords, not only 2. Are 2 of them supposed to be identical ?

Sonja
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SteveJCommented:
There are only 2 passwords . . . you accessed them in 2 different ways.
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SteveJCommented:
So do you have this working or not?

SteveJ
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Sonja_MAuthor Commented:
Hello SteveJ,

yes, now it is working ! Thank you very much for your help ! My thanks go also to OOsorio and dee_nz :-)

As a feedback, I really have the impression that the password from the "ultra vnc settings" is of no use. What is needed is the password from the "ultr@vnc server property page".

Best regards, Sonja
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