Remote Maintenance Tunnel

Need not port mapping, need not dynamic DNS, control computers inside the LAN of your customer with any program you like. Remote Maintenance into Intranet! For provide servings to customers, are you often need to operate customer?s computers? But if the computers of customer are inside their LAN, are you not afraid of hardwork and had to going to customer?s office at once, or loathly, use some remote control software witch can pass through gatew