Start embedded Web server on this port. If you want to use an external webserver you won't need this, but it's a handy option for a quick development setup.
Most configuration is done in the Hop property files.
There is a central file called server.properties in the Hop home directory. These values can be overridden in the app.properties files in each application directory. This property defines the character encoding. You can use any of the encodings supported by Java . This property defines the Hop working directory.