I'm trying to configure an old Windows Share Point Server 2.0 so that it will be reachable via internet or a least by a url other than http://companyweb/. Is this possible?
It is running on Windows Small Business Server 2003
Where exactly are you seeing problems? Have you created an appropriate DNS entry and set up alternate access mappings (or created a site with the desired URL via stsadm) in the Sharepoint configuration?
In the meantime you could read up this blog article for some examples for WSS 2.0 as well as 3.0.
Also, consider upgrading to a newer version (WSS' current name is "Sharepoint Foundation 2010", but it will only run on 64-bit Windows Server 2008 platforms, so you will have to go with WSS 3.0) - WSS 2.0 is ancient.