This is the (optional) workspace server folder.

You can use this for better scalability. You can instruct the MoJ server
to delegate workspaces (for compiling and testing) to one or more of
these worksspace servers.

You can start the workspace server using the start-workspace.bat file.
It will listen on port 8081 (default) for connections.

In order to let the MoJ server connect to the workspace server you need
to specify the workspace server ip address on the command line. Like : 
java -Xmx1024M nl.moj.Main ./data/cases/%1 ./data/team.properties 127.0.0.1
or
java -Xmx1024M nl.moj.Main ./data/cases/%1 ./data/team.properties 127.0.0.1 resume
in resume mode.

You can specify multiple workspace servers.

