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Desktop Share is a free remote control / remote help desk application (similar to LogMeIn Rescue or GoToMyPC) featuring no installation, small size (230KB), gets through firewalls and is customizable making it perfect for technical support companies. You can even host the service on your own web server.
Screencast Tour
Desktop Share
Desktop Share allows another user to take control of your keyboard and mouse and view your screen. Just click Launch, no installation is required.
Launch
Desktop View
Desktop View lets you remotely control a PC running Desktop Share. You can see their screen & use the mouse and keyboard as if you were sitting at their PC
Download
Desktop Gateway is the "middleman" between Desktop View and Desktop Share. It resides on your server and allows multiple connections to multiple clients so it is very handy for technical support departments
Download
Screencast TourDesktop Share 
Desktop Share allows another user to take control of your keyboard and mouse and view your screen. Just click Launch, no installation is required.
LaunchDesktop View
Desktop View lets you remotely control a PC running Desktop Share. You can see their screen & use the mouse and keyboard as if you were sitting at their PC
DownloadDesktop Gateway
Desktop Gateway is the "middleman" between Desktop View and Desktop Share. It resides on your server and allows multiple connections to multiple clients so it is very handy for technical support departments
Download