The installation will setup entries to launch an FWTools Shell and OpenEV under an FWTools program group in the Start->All Programs menu. The OpenEV entry launch the OpenEV application. The FWTools shell launchs a DOS shell (cmd.exe) with the environment pre-initialized to use all the FWTools commands.
To use FWTools commands from other command shells just call the setfw.bat script in the FWTools install directory to setup the environment appropriately.
By default the OpenEV and FWTools Shell icons on the desktop will start in the FWTools install directory but they can be safely changes to start in any user writable directory by editing the icon properties.