How to obtain a yahoo username off a computer

["Potter, Tim" <Tim.Potter () clarkconsulting com>]

Hello!  We have a security issue and need to know who is using a
particular Yahoo user ID from within our company.  We are about 90%
certain of the person's identity.  This user has been deleting his
cookies and temp Internet files.  We want to search his computer to see
if Yahoo ID xxxx is somewhere on his computer.   We know the Yahoo user
ID - we just need to confirm that this person is using it.  We don't
want to contact Yahoo because we don't want to go down the legal road
needed to get them to release the info.  Any ideas?
Thanks,
-Tim

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