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* the optional second one specifies the linked subarea(s) of the prior. Not all main areas have such subareas.
* about the third parameter
** the key <code>state</code> determines when the page background is recalculated. <code>state=repeat</code> ensures that the page background is always recalculated (useful if you want to use a variable that depends on the current page, such as its number with {{cmd|realpageno}}). ** <code>state=stop</code> recalculates, and stops the automatic recalculation,** <code>state=startstop</code> stop doesn't recalculate, and start recalculationsstops the automatic recalculation.
Because {{cmd|showframe}} and {{cmd|setupbackgrounds}} both draw frameboxes over parts of the page, the order in which they are invoked matters. In most cases, {{cmd|setupbackgrounds}} should come last.