Pass a variable value dynamically for Web reporting

Hi,

I have a requirement in which I need to show only one particular customer id's account details when he logs in to the portal. When I integrate a report as an iView in a portal, is there any mechanism by which the Id can be dynamically passed to the web query at run time and then show the corresponding report.

Kindly help. ( Points assured -:) )

Rgds,

Sam..