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mnm_pistha - 5:53 am on May 30, 2007 (gmt 0)
Yes, for example product_information.php would be common common for all the sites. it will be one single physical file. When site1.com/product_information.php is accessed, the system would load the layout set for site1 with the information (loaded from the db) of site1 Similarly site2.com/product_information.php will load site2's layout and site2's data.
If I understand you correctly, you would like to reduce the hassle related by maintaining technically similar sites, and instead want to keep one core system and let the domains access those.