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* [[/Alarms ODB tree]] ...em, which by default is turned off. When the alarm system is [[/Alarms ODB tree#Alarm system active|activated]] and an alarm condition is detected, alarm m

...cumentation under [[History System]], [[/Logger ODB tree]], [[/History ODB tree]] ...(create history_xxx.cxx, add constructor to hs_get_histrory(), create the ODB /Logger/History/x/channel).

* [[/Sequencer ODB tree]] ...on the [[Status Page]] is pressed, the ODB [[/Sequencer ODB tree|Sequencer Tree]] is created. If the Sequencer button is not present on the [[Status Page]]

{{mhttpdpages3|[[Sequencer]]|[[/Sequencer ODB tree]]|[[Edit-on-Sequence Parameters]]}} * The Sequencer Page takes its parameters from the [[/Sequencer ODB tree]].

* [[/History ODB tree]] * [[Keys in the ODB /Logger tree|/Logger ODB tree]]

The {{Odbpath|path=/Custom}} ODB tree is required if the user wishes to create [[mhttpd]] custom pages. It contai = Creating the <span style="color:purple; font-style:italic;">/Custom</span> tree =

...rt number by editing the ''localhost port'' ODB key in the [[Webserver ODB tree]]. ...ections from other machines), see the relevant keys in the [[Webserver ODB tree]].

== Creating the <span style="color: purple;">''/Experiment''</span> tree == ...ODB tree is created automatically when the '''[[odbedit #Creating the ODB|ODB is first created]]'''.

* [[ODB|Using the ODB]] * [[Online Database|ODB structure]]

* [[mhttpd]] ODB page * [[Online Database|ODB structure]]

*Online Database (ODB) - ''Dynamic Database holding all user information related to a given exper ...called "consumers". MIDAS defines separtate shared memory regions for the ODB (Online DataBase) data buffer, messages, alarms and history systems.

* New ODB variable <code>/Experiment/Enable sound</code> can be used to globally prev * Custom pages can now tie a <code>select</code> drop-down box to an ODB value using <code>modbselect</code>.

The ODB and other shared memory buffers for the MIDAS experiment will reside on the ...he odbedit tool to edit settings in the [[Webserver_ODB_tree|Webserver ODB tree]]:

* [[Equipment List Parameters]] * [[Equipment Flags]]

* [[ODB Page]] * [[/Custom ODB tree]]

{{mhttpdpages3|[[Custom Page Features]]|[[/Custom ODB tree]]|[[Mhttpd.js|MIDAS Javascript library]]}} ...ODB parameters or data to the user. They can contain specific links to the ODB so the user may also input information relevant to the experiment. Users cr