== hydra, nossy, and other systems ==

* '''hydra''' ([[http://hydra.as.utexas.edu]]) is a public-facing computer in Austin and provides PI access to programs, allowing:
   * PIs to submit targets into their program
   * PIs to edit status of targets in their program
   * PIs to display which targets have been observed from their program [[br]]
 Hydra also contains our documentation for PIs: [[https://hydra.as.utexas.edu/?a=help&toc_X=1]]

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* '''nossy''' ([[http://nossy]] or [[http://192.168.66.95/noss/]]) is a computer that lives inside the HET firewall and runs a lot of our night operations including the queue and night reports, allowing:
   * RAs to accept/reject new targets and allocations into the queue
   * RAs to use interface to see targets/programs/changes/etc ([[http://nossy/noss/RA/interface]])
   * RAs to access the RA Night Report ([[http://nossy/noss/RA/NightReport]])
   * RAs to access the OPS webpage ([[http://nossy/noss/RA/OPS]])
   * RAs to access htopx ([[http://nossy/noss/htopx3]]
   * many other Night Operations Software Systems

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* '''depot''' ([[http://depot.het.astronomy.utexas.edu]] or [[http://192.168.66.63/]]) is a computer that lives inside the HET firewall and is an exact copy of everything on nossy.

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The data content on '''nossy''' is the official version of the observing queue, and is the version that we interact with in htopx/NightReport/etc. For security reasons '''nossy''' is available only inside the HET firewall. All data content is ''replicated'' to '''depot''' and then replicated to '''hydra''' for external access by PIs and other users. Any changes made on '''nossy''' will propagate through '''depot''' to '''hydra''' almost instantaneously. This synchronization process is called ''replication.''