url helper

[eluser]osgaldor[/eluser]
I'm a little lost with using the url helper. I have a .htaccess file removing the index.php file from the url, but I'm not clear how to correctly use the anchor() function. I'm just testing a dummy controller and view, I want a link to simply go back to the same directory, but every time I put a segmented url in the parameter list, I get a 404 error when I click it. What is that segment argument relative to?