If you have your own server then to add subdomains you need to edit the httpd.conf file and add more VirtualHosts. It shouldn't be too complicated. You can then point the subdomains at the same directory as the main domain to use the same files. You can then pass a variable in the url to tell the program which template set to use and use rewrite rules to hide this variable.

This could work if the site only consisted of Links, but Links will be part of an HTML structure that has to also be flexible. For this reason, I was looking at a traditional subdomain, rather than just buying secondary URLs.[/quote]

Not sure I understand why you think this is a problem - you just create VirtualHosts for each subdomain. Or even just use the VirtualHost you have setup for the main directory and use rewrite conditions to redirect the subdomains. If you want the subdomains to have a different path on your server, then I think you could just rewrite the GLinks urls to the main GLinks path but I haven't thought this through fully.

The variable you need is t for a different template set as far as I can remember.

This is the apache document for using mod_rewrite:
http://httpd.apache.org/...mod/mod_rewrite.html