To Send message from one computer to other by Dynamics axapta code you can try following code in ax job.
  COM           netSendComObj;  
   InteropPermission  InteropPermission1 = new InteropPermission(InteropKind::ComInterop);  
   int             Result;  
   str NameOfMachine  = Winapi::getComputerName();  
   str MSG      = ‘Hello how are you.Do you know me I am Dynamics AX’;  
   InteropPermission1.assert();  
   try  
   {  
     netSendComObj = new COM("WScript.Shell");  
     Result = netSendComObj.Run(strFmt("net send %1 %2", NameOfMachine, MSG),0,true);  
   }  
   catch (Exception::Error)  
   {  
     CodeAccessPermission::revertAssert();  
     throw Exception::Error;  
   }  
   if (Result != 0)  
   {  
     warning(strfmt(‘Sending message Failed’, NameOfMachine));  
     warning(‘Check messenger service is Started’);  
   }  
   CodeAccessPermission::revertAssert();  
