Workgroup

1. Open the System Properties Dialog Box, by right-clicking on My computer on your desktop.
2. Go to the Network Identification tab and click on Properties. In Windows 7, go to Start menu (main bar), click with right button on "Computer" and choose "Change settings" in the "Computer name, domain and workgroup settings" session).

3. Press che Properties button. In the Computer name field input the name of your machine (declared when you asked for an IP number). 
4. In the Workgroup field always input the value SINCRONET.

5. Click OK to return to the System Properties dialog box. 

Note: you cannot change both the Computer Name AND the Member of settings in one step. You have to set one of them, click OK, return to this dialog box (using the button Properties) and set the other option.