go to command type: net ? also type: net send ? This will give you the synatax. Make sure you put the spaces in You may need the domain name if you are on a domain then the computer name or username. If it is a workgroup just type: Net Send username message If it is a Domain, type: Net Send /Domain name/username message
look at microsofts documentation http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_send.mspx?mfr=true
/netsend 192.168.1.??? just like that the other user that you wont to do it to has to have net start enabled...
