Hi Peter

The easiest way is to put a bottom border on the paragraph. To do this do
View > Headers and footers and go to the header you're interested in. Format

any border you like. This is the simplest way to add a line. It will always
be in the same place relative to the header text, you can't accidentally
drag it somewhere else, and if you delete the text, the line goes away too.

If you want all headers in your document to have a border, then format the
Header style to add the border to the style. But don't do this if, for
example, you have no header on the first page, or a letterhead or logo in
the first page header and you don't want the line there.

By the way, you can still use a Frame in recent versions of Word. In Word
2002, the Insert Frame command is hidden away on the Forms toolbar of all
places. If you use it a lot, use Tools > Customize. On the Commands tab, in
the Categories box, choose "All commands". In the Commands box, choose
Insert Frame. Drag that to, say, the Insert menu.

Hope this helps.

Shauna Kelly.  Microsoft MVP.
http://www.shaunakelly.com/word