How to return multiple successive pages from a single .php execution?

Can anyone suggest the best technique for returning a page whislt
continuing .php excution to then return another page?

I need this to provide a status update page to the user during a long
execution of the .php, and would rather not break the script into one-page
sections since this requires me to manually carry the work-in-progress
data between them.

Thanks.
--
Chris