tlp code using the |cat:"{ what does this do please its in a smarty tpl file

have the below code and not sure what the |cat:" does is it the equilavent to & or . for php but used in tpl to assemble strings???

{assign var="page_hdr01_text" value='
	<a href="section.php" class="subhead">
	'|cat:"{lang mkey='section_title'}"|cat:'</a> >
	<a href="sectionquestions.php?sectionid='|cat:$smarty.get.sectionid|cat:'" class="subhead">'
	|cat:"{lang mkey='questions_title'}"|cat:'</a> > '|cat:"{lang mkey='options_title'}"}

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