Targeting specific frames
You can target a frame that's been named:
<FRAMESET COLS="20%,*">
<FRAME SRC="left.html">
<FRAME SRC="right.html NAME="right">
</FRAMESET>
From inside left.html you can say
<A HREF="right-new.html" TARGET="right">Place a new
frame on the right</A>.
Notes:
Mention explicitly the TARGET option in the A tag.