Multiple Domain Names pointing to same GS installation

[vanfruniken]

would relative url hack not suffice?

What do you mean with relative url hack?  Is there any relative url support in GS 3.3.13 or is that for GS 3.4? 
The purpose is to have the same multilingual i18n site, where visitors from another country (and the corresponding language), don't ever get to see the base country's domain (not in the url line, not in the status line, and preferably not in img, metatags for those who would inspect the html source in their browser's dev mode).

I want to avoid maintaining separate sites (my pre-GS situation). Tests for language/vistor_country can easily be built into the common contents/components.

Thanks for your response.