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* The first parameter sets the main layout area;
* the optional second one specifies the linked subarea(s) of the prior. Not all main areas have such subareas.
* the third parameter drive determines when the page background is recalculated. <tt>state=repeat</tt> makes sure ensures that the page background is always recalculated (usefull useful if you want to use a variable depending that depends on the current page like , such as its number with {{cmd|realpageno}}). <tt>state=stop</tt> and <tt>state=start</tt> allows to stop and start recalculations.
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.