HTC Cluster can be accessed through ssh at htc-fe.rmlab.infn.it
You can login using your own roma2.infn.it username (no need to add roma2.infn.it domain in the username) and password.
All cluster nodes mount, in the /cvmfs folder, the following cvmfs software repositories:
It's possibile to mount other repos if needed.
HTCondor basic how to is described here