TeamViewer

TeamViewer 10 

TeamViewer is a solution for remote control, desktop sharing, and file transfer that works behind any firewall and NAT proxy. To connect to another computer just run TeamViewer on both machines without the need of an installation procedure. With the first start automatic partner IDs are generated on both computers. Enter your partner's ID into TeamViewer and the connection is established immediately.

TeamViewer Features:
Remote Control without Installation
With TeamViewer you can remotely control any PC anywhere on the Internet. No installation is required, just run the application on both sides and connect - even through tight firewalls.
Remote Presentation of Products, Solutions and Services
The second TeamViewer mode allows you to present your desktop to a partner. Show your demos, products and presentations over the Internet within seconds - live from your screen.
File Transfer
TeamViewer comes with integrated file transfer that allows you to copy files and folders from and to a remote partner - which also works behind firewalls
Works behind Firewalls
The major difficulties in using remote control software are firewalls and blocked ports, as well as NAT routing for local IP addresses. If you use TeamViewer you don't have to worry about firewalls: TeamViewer will find a route to your partner.
Highest Security Standard
TeamViewer is a very secure solution. The commercial TeamViewer versions feature completely secure data channels with key exchange and RC4 session encoding, the same security standard used by https/SSL.
No Installation Required
To install TeamViewer no admin rights are required. Just run the software and off you go...
High Performance
Optimized for connections over LANs AND the Internet, TeamViewer features automatic bandwidth-based quality selection for optimized use on any connection.