The <i>Preferences</i> button opens the preferences window. Preferences are new since Weblab 6.1 and are used to save certain parameters between different Weblab sessions. Preferences are working with cookies. Right now preferences can be set for the following quantities: 
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<b>skin:</b> Defines the layout. You can choose between 'polymer','classic','bluesky' and 'minimal'. The classic view is based on the color scheme of version 5.0.
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<b>start window:</b> Per default Weblab starts with the introduction page. From there you can choose different programs. You can skip this by setting either <i>1d Echo</i> or <i>2d Exchange</i> or <i>Tensor Plot</i> as start window.
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<b>start mode:</b> Weblab can be run in <i>expert mode</i> or <i>basic mode</i>. In <i>basic mode</i> not all features are  accessible, on the other hand, the menus are shorter and have a clearer layout. Here you are setting the mode, in which Weblab will start. Note, that <i>basic mode</i> is not available, if <i>keep data</i> is set to 'yes'.
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<b>keep data:</b> If set to <i>yes</i>, Weblab will keep all input data of your last successful run and will start with these data on restart.This option is valid in <i>expert mode</i> only.
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<b>allow cookies:</b> With this setting you give or withdraw your agreement for Cookies. Please note that preferences can be used only, when Cookies are allowed.   
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<b>range slider:</b> If this option ist set, a slide bar can be used as an additional input tool.
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<b>maxmimum runtime:</b> Weblab aborts runs with estimated runtime &gt; 180sec. You can increase this value up to 600.
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<b>frame width:</b>If supported by your display you can set a wider frame width for output and clipboard window.
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When you hit the <i>submit</i> button, your preferences are saved for 30 days as cookies in your browser.