Can we know the Windows login name using T-SQL?

Hi everybody!

When we start Windows 7, it asks for the User Name and password.

Is it possible in T-SQL (I use SQL Server 2008) to discover this User Name?

What is the SQL code that will do the job?

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In case you wish to know my motivation, here it is:

I use an ERP software in my company. I wish to know who has logged in.

Unfortunately, not every user has a distinct user name.

The same user name and password is shared by several persons.

So, I am trying to use the Windows user name instead, assuming the person who logged in the ERP is the same person who logged on to Windows.

Thanks

Leon Lai