Please create a file .jfkserverrc with a line 'level=<levelfile>' where
<levelfile> is one from %%DATADIR%%/levels/ or your own and a file
.jfkclientrc with a line 'name=<yourname>' in your home directory. For more
information about other variables read %%DOCSDIR%%/jfkserver.sample
and %%DOCSDIR%%/jfkclient.sample.