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<title>Preferences</title>
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<body bgcolor=ffffff>
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<h2>Preferences</h2>
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<p>
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Participants can specify <b>preferences</b> determining and limiting
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how BOINC uses their computers.
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Preferences are divided into three groups:
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<ul>
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<li> <b>Work preferences</b>
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<ul>
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<li> Whether work (computation and network transfer) should be done
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while the host is being used (i.e. during keyboard and mouse input).
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<li> Whether work should be done while the computer is being powered
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by batteries.
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<li> Whether to wait for user confirmation before making network connections.
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<li> Minimum and maximum amounts of work to maintain on disk.
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These values are expressed as time values.
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The client will try to ensure it
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has at least enough work to keep it busy for x days, and at most y days.
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If the host is frequently disconnected from the Internet, the minimum
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level should be at least as long as the typical period of disconnection.
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The larger the difference between minimum and maximum, the less often
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BOINC will connect to the Internet.
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</ul>
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<li> <b>Disk preferences</b>
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BOINC's usage of disk space can be limited in one or more of the
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following ways:
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<ul>
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<li> Maximum disk space used by BOINC.
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<li> Maximum disk percentage used by BOINC.
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<li> Minimum disk space to keep free.
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</ul>
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<li> <b>Project preferences</b> (one set for each project)
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<ul>
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<li> Master URL of project
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<li> Email address
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<li> Authenticator
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<li>
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Resource share: if projects contend for resources, the amount
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allocated to a project is proportional to this number.
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<li> Whether to show email address on web site
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<li> Whether project should send emails to user
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<li> Whether this is the home project (see below)???.
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<li> Project-specific preferences
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</ul>
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</ul>
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<p>
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Each participant has a single set of preferences.
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If you want to have different preferences for different hosts,
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you must create a separate accounts.
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<h3>Propagation of preferences</h3>
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<p>
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The BOINC core client on each host stores a copy of its user's preferences.
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Whenever a host contacts a scheduling server, the request
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message includes the preferences and their last-modification time.
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If the server has a more recently modified version of the preferences, it
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returns these to the client.
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Thus a change to preferences is quickly
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propagated to all hosts, and to the databases of all enrolled projects.
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A participant may edit preferences on the web site of any enrolled project;
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however, care should be taken to ensure that a change isn't
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overwritten by an earlier change.
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The easiest way to do this is to edit preferences only at one web site.
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