Timbuktu Pro lets you remote control computers across the internet; this is very useful for managing servers, remote troubleshooting and assisting friends and family. Timbuktu works with machines behind routers and firewalls and the screen-sharing is the fastest of any remote control product. It also works with PCs. Security features include both attended and unattended access modes and built-in SSH tunneling. Other useful features include file transfer, remote user activity detection, Quicktime recording, Skype integration, DHCP "tracking" and the ability to use modem connections.