Okay, here goes. A server side include usually puts out specific code for
specific users. Once that code is produced for the user, it doesn't matter
where it came from. The trick is to be sure the server is detecting what it
needs to detect, in order to put the proper code out to the user. Unless, I
misunderstand your question, it seems you would benefit from learning more
about the difference between server side and user side. This forum does not
usually respond to questions regarding code.