PHP && MySQL: temporary table problem

Hi. I got a task to program a search engine for a site which is all around based on sessions and persistent connections to MySQL. The problem is that I first have to select a subset of those data and then I have to join them all around and output results. I'm using temporary tables for this but there is a problem. Temporary tables are visible trough the entire connection. So in future one browser window can interact (can display) with results from another browser window. Does anyone have a sugestion how to solve this? I was thinking to close a persistent connection (I don't know how???) on each result page at the begining and then reopen it at the end ... for my code I was thinking on using normal connections. Any better idea? I thik I just can't live without temporary tables till I will not have subqueryes. Regards, Dezo