Hmmm... no idea. That feature is relatively new, and I haven't worked with it yet. It's probably PHP based, but that's not much help. If you're comfortable digging through code, you could check the code surrounding the init_start, global_start, and parse_template hooks.
Also, try asking over in the programming discussion forum. That would probably be a more appropriate forum for your question.
-Nick, SEOvB Developer
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