@Johonwayni
Haha, nice graphic examples. :-)
I've done some quick experiment.
Assuming both the GS site and the subdomain are in the same server, but different folders, this could be the code for your carlos.php (or johonwayni.php) file:
Code:
<?php
$gspath = '../gs31/'; // relative path to the actual GetSimple dir
include $gspath.'admin/inc/common.php';
include $gspath.'admin/inc/theme_functions.php';
include $gspath.'admin/inc/plugin_functions.php';
include $gspath.'admin/inc/caching_functions.php';
include $gspath.'theme/Innovation/functions.php'; // remove this if you don't have a functions.php in your theme
$title = 'The page title';
$content = 'Hello Johonwayni!'; // your script should assign all the content of the page to this variable
exec_action('index-pretemplate');
include $gspath.'theme/Innovation/template.php';
exec_action('index-posttemplate');
//end
In my test site, GS is in /htdocs/gs31/, and the subdomain is in /htdocs/sub/ (hence the "../gs31/" at the beginning). I've used Innovation theme, change the 2 lines where it appears to your theme's folder.
It more or less works. Don't know if there are potential problems (with plugins, etc.), as I say this is just a quickie.
edit:I've made some changes, now get_navigation() renders the menu.