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Put something like this in the WIKI MARKUP Wiki Markup Edit screen: {anchor:evaluation}. In my scenario, I put that above a section titled "uPortal Evaluation Plan" on this page: uPortal UX Walkthrough Subgroup
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You can reference the anchor from the SAME screen using Wiki Markup like this [uPortal Evaluation Plan|#evaluation]. However, you can also just link to the section header WITHOUT creating the anchor like this: [#uPortal Evaluation Plan]. It appears confluence is smart, and when it saw that I'd entered a link with the same name as a heading, it actually took out my link to the #evaluation anchor and substituted this second link instead.
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You can reference anchors from OTHER screens by putting markup like this in the WIKI MARKUP Wiki Markup Edit screen: [uPortal Evaluation Plan| uPortal UX Walkthrough Subgroup#evaluation]. This will create a link on the page you put it (e.g. http://wiki.fluidproject.org/display/fluid/uPortal+User+Experience+Walkthrough+Report, in the "Scope of Walkthrough" section) to the uPortal Evaluation Plan section of the uPortal UX Walkthrough Subgroup page.
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