Get User Name - Active Directory

Hi,
I am working on project, where I need to send automated mails from users desk.
While sending I need to add the line Regards, <Logged in Name>.
But i am able to get the logged user, but the problem is the log id in out office is the empno, And the variale Environ("USERNAME") is giving me the emp id.But I want the name which is stored in the active directory.
E.g: 012012, in the Active Directry the name is stored partik leonard.
How do i get the Name.
Thanks,
Jai

That made no sense what so ever but i use this to get the username of the perosn logged on to a computer:

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I hope that helps if not sorry buddy