Filter published report from the outside?

Hello everyone.

I need to know how to get a filter from extern code wen publishing my report in a webpage (no public).

We got a system that any user acces with theire own password, so instead of creating a different report to any customer and add a frame for each one, I need to create just one report and filter from de code to select the data to show for each user.

It is possible? or wish should be the way to solve this?

Thanks a lot