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well..without the periods and with actual data, that’s what you put in CMS pages (via the Admin) to have it show a pre-defined block.
In that case, the controlling Block php file will be in app/code/core/Mage/Page/test
The most important attributes are TYPE which tells you what block is being used, and TEMPLATE which tells you which .phtml file is being used to output the HTML / code from the php file.