Frames are updated using targets. Targets are simply hyperlink tag extensions that contain the frame name. Targets specify which frame the hyperlink should update.

Here's an example of the target.

You can use the <BASE TARGET="frame name"> to set a default target. If the majority of links on a page affect one frame you would want to use the <BASE TARGET> tag.

There are also several reserved target names available:

_blank

Always load this into a new, unnamed window.

_self

Always load this link over yourself.

_parent

Always load this link over your parent (becomes self if you have no parent).

_top

Always load this link at the top level (becomes self if you are at the top).