Sending AT commands using microsoft hyperTerminal

MS Hyperterminal is a small program which can be used for sending AT commands to ur GSM/3G phone connected as modem to ur PC. For linux users minicom can be used as HyperTerminal.
for getting hyper terminal in windows Vista and 7 use this link
Hyperterminal can be found in start->programs->accessories->communications->Hyperterminal

You should first check ur device whether it's connected properly, and working fine or not.

Now you should set up ur device as modem. In Hyper terminal you can start a new connection and select the com port where your device is appearing (check in device manager).

Now you can send the AT commands to ur device.

Now you should Type "AT" in the main window.
A response "OK" should be returned from the modem.
Now type "AT+CPIN?" in the main window.
The AT command "AT+CPIN?" is used to query whether the modem is waiting for a PIN ( i.e. password). If the response is "+CPIN: READY", it means the SIM card doesn't require a PIN and its ready for use.
else you can set the PIN using "AT+CPIN=<pin>"

Alternatives for Hyper Terminal in windows vista and Windows7

for getting hyper terminal in windows Vista and 7 use this link or you can use following options:

> windows remote shell (WinRS)
> use phone and modem options if you are using Hyperterminal for modem connections (AT Command).
> Can use Putty also. Download putty.exe

For getting more info on WinRS type "winrs /?" in your command prompt.

Using Remote desktop from command line

Remote desktop allows you to configure and connect to another computer running Windows XP Pro.
Host machine must also have the Remote Desktop Connection client software installed. The  remote computer which is known as the client and Host both should be part of a corporate network in which Remote Desktop connections are permitted.

The Windows XP remote desktop connection dialog box provides you with everything that you need to configure and connect to another computer running Windows XP Pro. You can use the Save As button on the Connection Settings panel to save all your connection settings as an RDP file. Then, you can launch and connect to a remote computer simply by double-clicking the RDP file.


You can also script a remote desktop connection, as Windows XP's remote desktop connection has an executable file that can accept command line parameters and be run from a batch file. The remote desktop connection executable file is MSTSC.EXE, and the following are some of the most common parameters:

/v:<computername>--specifies the name of the computer to connect to.

/f--starts the connection in a full screen.

/w:<width>--specifies the width of the remote desktop screen.

/h:<height>--specifies the height of the remote desktop screen.

For example, to remotely connect to a computer named System in a 640 x 480 remote desktop screen, you would use the following command:

mstsc /v: System /w:640 /h:480

You can type this command line in the Run dialog box, as well as use it in a batch file.

Ref:
WindowsXP: Using mobility
Remote desktop FAQ

Difference between VPN and VNC

VPN is called as Virtual Private Networking and VNC is called as Virtual Network Computing.



VPN is a software implementation that allows users to connect that are on large public networks(Internet), it actually provides a kind of tunnel between the parent network and your local network ( VPN provides secure, authenticated remote access to campus networks and services) while VNC is also a software which provides completely different functionality. It's used for controlling the desktop of a computer from another computer via the network connection. VNC and remote desktop are diffrent protocols which have same functionality. It allows you to share your desktop.

VPN is more advanced version of tunneling protocols. Hamachi is an example of VPN which requires zero configuration and is freeware. VPN is complete virtual networking solution. Suppose you have three different locality where you want to have access. You can buy routers, cables and make physical connections between localities or you can configure VPN and go through your ISP connections which won't need any routers.


VNC is helpful to access your desktop from some other computer or if need to access your files securely from other system. Remote Desktop is another famous application which replaces VNC, and these can be used by IT team to take control of your computer to change or fix any software issue. Some large IT companies use this as it is lot faster compared to taking system to IT workstation.
RealVNC, TightVNC, UltraVNC are some of the VNC available in market. RealVNC is created by RealVNC company which is founded by the same AT&T team which created the original VNC program

A disadvantage of using VNC is that it utilizes a lot of bandwidth because it constantly sends updates of how the screen appears. If you want to use VNC over internet then you need high spped internet connections at both ends. Also it will need to configure things properly including router and firewalls to have connection proper.

Having a functional VPN in place makes the whole process a lot easier as it removes the additional steps that needs to be taken in order to ensure that the connection is accepted as it should be and then VNC can be used over VPN.

VNC is often used on top of VPN to access another running computer or files on it. VPN is used to create a private network on top of a larger public network like internet while VNC allows a user to control another computer over Ethernet.

For more information on VPN check: 
*Use Virtual Private network for secure data transfer
VPN-Info
FAQ About VPN
VPN Info on about.com
VNC Info on about.com

How to enable remote connection in your windows XP system

It's used to connect your system remotely from other system for access of data or programs.

control panel->system->remote tab

Make sure it's "Allow users to connect remotely to this computer" checked as in above picture.

you can see the name of computer to be connected is "system55". you can also add remote users who can use this system.

Now when you click on remote desktop connection under program files->accessibility->remote desktop connection then give the name of computer as "system55" and give user name and password for system.