<frameset>
<frameset cols="Comma-seperated list of column width definitations" rows="Comma-seperated list of row width definitations">
</frameset>
NICE FUCKING SPELL CHECK IN THAT EXAMPLES!!!
The <frameset> rows=""> attribute), sometimes vertically (using the cols=""> attribute), or even a combination of horizontal and vertical arrangements. Each child window inside the <frameset> is defined by the <frame> element.
A <frameset> requires a special frameset-specific-doctype, and does not allow for any content inside the body of the page (the FRAMESET actually takes the place of the BODY element).
It is possible to nest a <frameset> inside a parent <frameset>.
<frameset>S suck for bookmarking, seo and printing.
It is no longer necessary to use <frame>S and by implication <frameset>S for the purposes of creating the visual effect of a header that remains at the top of the page while the rest of the content scrolls - this can be carried out using Cascading Style Sheets.