Control parameters are parameters that can be added to a URL in the form of a querystring. They are used by the stylesheet to control the layout or output.
The following parameters are available:

name	possible values	effect
debug	1	display debug information
pf	1	display printer-friendly version of a page
xml	1	display xml source of a page (actually, it's the xml source with resolved entity references)
show_main_content_only	yes | no	only show main content element of the page
show_header	yes | no	show header element of the page
show_footer	yes | no	show footer element of the page
show_sitenav	yes | no	show site navigation element of the page
show_sectionnav	yes | no	show section navigation element of the page
show_highlights	yes | no	show highlights element of the page
show_floatingindex	yes | no	show floating index element of the page
page_width	an integer	width of the page (in pixels)
l_col_align	left | right	alignment of the text in the left column
ext	xml | html	file extension to use for internal links
is_under_construction	yes | no	display under-construction message
section_order	fixed | relative	order of display of site sections in the site navigation element
rollup_subsection	yes | no	rollup nested navigation sections in the site navigation element