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Within these directories are at least two files, a host.cfg (list of hosts and host groups) and a service.cfg (listing services and service groups). Inheritance is heavily used in order to avoid writing the same service checks or host directives repeatedly for each individual host. A generic template of basic services (e.g. ping, ssh) is inherited by all host files first and then the specific service directives are added on top of that.
To modify the sidebar you must check out the code from svn. The command is
svn checkout file://localhost/afs/slac.stanford.edu/g/scs/svn/systems/nagios-fermi-web
The sidebar is a temporary solution so SCS can work on groundworks.