THIS is a wiki external link that will take you to an anchor at the bottom of a wiki page on TikiMODS.com. I used the PluginA to put that anchor on the page. (You can go to that page and download the plugin for free.)
Here is the wiki external link I used for the above link:
Using the PluginA to make an anchor on a wiki page, you can then link to the anchor using external links on any wiki pages from your own site or from any other wiki site. You can use the anchor just as you would any anchor created from HTML.
In addition, if you have HTML enabled on your wiki, or if you want to link to the anchor from even a non-wiki web page, then a regular HTML link can be used to get to the anchor as well, i.e.: