The CCR servers run various versions of Linux. Users must know how to use the unix command line shell in order to utilize CCR servers. See below for links that will get new users started on utilizing the CCR clusters. You can also search the extensive knowledgebase for answers to your specific questions. If you can't find an answer, just submit a help ticket.
OnDemand - web-based portal providing a single access point for all HPC resources. Users can transfer files, access a shell environment on the cluster front-end login server, launch interactive and remote visualization jobs, and monitor jobs all without installing any client software or web plug-ins.
Are you trying to run on the cluster but your job keeps getting killed? This may be the reason