The Show tag is used to display something on the page.
It could be a literal string e.g.
<cms:show 'Hello World' />
or a variable (both system variables as well as all the editable regions on the page) e.g.
<cms:show k_page_title /> <cms:show my_intro />
No named parameters. Uses the first provided parameter.
This tag does not set any variables of its own.