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When you install Servoy, Sybase is installed by default.  If you dont plan to use Sybase, then on the installer, uncheck "database" and Sybase won't be installed.  

The Servoy Multi-Dev plugin comes pre-installed with Servoy. It is a Server-side plugin that allows broadcasting of changes and logging between developers. Since it is a server-side plugin, it is configured on the server (not developer).