There are two release versions of ShowMyDesktop available. ShowMyDesktop v.2 is based on Flash and uses the Adobe Flash Player to upload and download its stream. ShowMyDesktop v.3 uses Java to transmit its stream.
Please note that ShowMyDesktop v.2 is not currently being updated and only works on PC's running Windows. For more information on ShowMyDesktop v.2, please see this article - ShowMyDesktop v2
For information about using and installing ShowMyDesktop v.3, please see this article - ShowMyDesktop v3