This could be used in combination with #417664: Action: switch theme among many other use cases.

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mitchell commented
Project: Rules » Theme Rules
Component: Rules Engine » Code
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mitchell commented
Version: 6.x-1.x-dev » 7.x-1.x-dev
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mitchell commented

The closest related discussion I could find regarding Entity API and $_SERVER['HTTP_USER_AGENT'] was in #402438: Add proper API functions and hooks to allow other modules to interact with Feedback messages.