on your page where you wish to output the content you create a recordset to return the content for that page.
you can filter the recordset using the page column. When you store the content in the database, the page column is used to determine what page the content will be displayed on.
say you have content for the home.php page. In the page column you should have entered "home".
To output the home page content, create a recordset on home.php:
SELECT * FROM tblContent WHERE page = "home"
this will return all of the contnet areas for the home page, you can then use the recordset bindings to place the content where you wish,
Again, if you examine how the PowerCMS solution pack works, you can get a good idea of how to create your own CMS solution.