Authorization derived via web

Hi all,

I have to create a web application to plan data regarding 4 companies.

I'd like to create just one planning area-level-package for all companies and restrict users to plan on just their company using web data.

I mean, I'd like to choose company on web application (by clicking on 4 different links) and use this information on BPS-layout (in planning layout company is not fixed, but it's a free charatcheristic).

Is it possible?

How?

Thanks a lot

Alberto