Thanks Alan! :-)
I'm using Mac, though, but even if I did use Windows, just the unnecessary hassle with having this running on my machine is to me tiring. Especially if I'm not going to use the server / database at all after my work is done. Seems like too much to go through.
I mean, somehow, WordPress knows what theme I am using, because I select it in the admin panel, right? and I can change this with a flip of a switch, right? Now, if I could either use a special link (like stated in my previous post), or perhaps insert a special WP tag like <?php wp_use_theme('themename'); ?> in my test code (lying in a separate folder, away from my main (& 'public') web site), my prayers would be heard :-)
Or perhaps more correctly, since my test theme would not be the active one, but still be present in the same folder as the other themes:
<?php wp_test_using_content_from_main_db(); ?>
and then surf to the theme directory www.mysite.com/wp-content/themes/theme_name/ and see the result in all its glory... (Do I make myself clear? I'm doubting it.)
I've been snooping around in the documentation without finding such tags, though. But can they be made?