Check out lifehacker.com I've seen some third-party (free) programs
that allow you to do this. I'll look and see if I remember the
article I read. I believe it will have to be third-party though.
Check Google docs spreadsheet. That is a collaborative effort too.
If you can store the file on a common folder that everyone can access, you could
use Tools|Share workbook (xl2003 menus). Be aware that there are lots of
features that are unavailable in a shared workbook.
And lots of people around here recommend that you stay away from sharing
workbooks. Files get corrupted is one common complaint.
You may want to look at a different application that's built to allow
simultaneous updates -- like a database program (Access???).
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