Multiple Document Libaries

Does anyone know how to have a document in SharePoint 2007 exist in multiple document libaries.

So a singlar document can be accessed from multiple libaries, and when it is changed in one libary it is changed in the other.

Im sorry if this is a stupid question but Ive been trying to do this all day in SharePoint and its beginning to stress me out.

Thank you in advance for any responses.

Regards

Adam

[439 byte] By [essential_selection21] at [2007-12-30]