You can embed chatbox wherever you want on your site .
Example : on the top of your site
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Install the Simple Machines Forum to your website
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Get embed code chatbox
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Create function embedChatWing with width:100% heigh(option) file "Themes\default\index.template.php"
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Find function template_body_above file "Themes\default\index.template.php" and use function embedChatWing()
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Result