I'm trying to write my own .aspx web pages that calls office 2007
sharepoint server APIs and windows sharepoint services V3 APIs

I published the pages on the sharepoint server using the sharepoint
designer 2007 publishing tool

The problem is that when i try to open the pages i recieve the
following Error :
" Code blocks are not allowed in this file"

As it seemes that the server does not accept server side code.

I want to know the senario on which i can use the sharepoint APIs on
pages that are then published on the server.