We're implementing Aeon (a paging system that can handle requests for individual manuscript items from EAD finding aids as well as requests for mongraphs/serials) alongside Koha and we want to be able to display item availability in Koha. Since we're not using Koha's circulation system, we'll need to link Aeon and Koha so that an item checkout from Aeon sends a database UPDATE call to Koha and updates items.onloan with the desired due date (or at least, that's what I've been able to sort out by poking around). First, am I correct that updating the availability status of an item in the Koha Opac requires *only *that we update this field (items.onloan)? Second, in order to generate the SQL query, something like "UPDATE items SET onloan=2010-03-10 WHERE itemnumber=706," we'll need access to the itemnumber from within the OPAC record in order to generate the OpenURL that Aeon uses to generate requests. Is this variable available from within the opac-results.tmpl and opac-details.tmpl templates? Can someone tell me how I can call this data? On that note, does any documentation exist detailing bib/item data variables like this that can be called from within Opac templates? -- Cheers, Christopher Curry Assistant Technical Librarian / Assistant IT Officer American Philosophical Society 105 South Fifth Street Philadelphia, PA 19106-3386 Tel. (215) 599-4299 ccurry@amphilsoc.org <mailto:ccurry@amphilsoc.org> *For technical support, please use helpdesk@amphilsoc.org <mailto:helpdesk@amphilsoc.org>* Main Library number: (215)440-3400 APS website: http://www.amphilsoc.org