Is it feasible to include session_start() multiple times in 1 page?
Usually, I;d say "no"...but in this case, I'd say it's OK (I don;t think the PHP police will be knocking on your door if you catch my drift)...
The first time on your parent page, use
Then on included pages, or pages that may or may not be included in the parent page, use
to suppress the "headers already sent" warning messages I think you will probably get...but the code should still function....well I think it should, but I haven;t tested this theory