This application can run programs to check the network status of critical devices and if they are live. Netlistener informs immediately if a network server is failing or a laptop is being removed. The application checks the connection to all computers registered under the configuration through the ICMP protocol (ping). Changes in the system status of registered devices (a registered device joining or leaving the network) cause an action, like for example starting a batch file (this batch file may contain the call “net send …”, if the user wishes to communicate the failure). The application has been programmed as a service, running even when there is no user logged onto the device. The device name is passed to the application and logged in the file (see example in the subfolder /scripts). Netlistener also provides the option to generate a status page in HTML format. This can be posted to the internet through your web server.

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After installation a new service called “NetListener” can be found in System management => Services. Here is where the service can be started / stopped etc. The service can also be initiated from the console:
Net start “Netlistener” (start)
Net stop “netlistener” (stop)

The next two commands should be executed in the application register:
Netlisten /install
Netlisten /uninstall

Most users will not need these instructions as the application comes fully configured once installed. You only need to start Configurator in the program group to tune the surveillance.
The Configurator contains a table to set the configuration. The first field takes the host that is to be supervised. The second field takes the order instructions when a device leaves the network. The following field takes the order instructions when a device enters the network. It is not necessary to fill in both fields. The 4th field allows activating or deactivating the instruction. The 5th field defines if action is requested as soon as the service starts or only until a change in status has been detected. The following field shows the current state with the last field indicating the time and date (Roundtrip).

Example
You have a server on your network collecting important data. You will appreciate to know if the server is down before your boss is asking for the data. The instruction settings for this scenario could be “net send localhost "Computer %1 is not available”.

An instruction for a message to users logging onto the network could be (net send devicename “Hello and welcome to my network”.)

Or, just imagine the following situation: You have a modem allocating a specific range of IP addresses. To be informed about users logging in you could log the IP addresses in a batch file in the Configurator under “Execute when Connecting” with the following content: net send devicename "Einwahl auf Modem X"

If you have computers in unsupervised areas which you would like to protect against theft you can generate an action as soon as the device is taken off the network.

It would also be possible to send e-mails or SMS text messages to report the status change. This requires activating an application that sends the e-mail or SMS. The scripts folder contains the application “SendFax”, which can send you a fax with the command line. Integrating this application into your batch file is easy.
Start back-up as soon as back-up server becomes available.
Start data synchronization as soon as laptop is on the network.