How do I find usernames?

Does anyone know how to tell who's logged onto a windows NT environment, and how they wrote their username when they logged on?
like you would have a listbox filled with usernames.
and if they typed in: UsErNaMe it would say that instead of Username.
Anyone.


I haven't been able to get on in a while, the new webpage wouldn't work

VB Code:

Private Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpbuffer As String, nsize As Long) As Long
 
Private Sub Command1_Click()
    ' Display the name of the user currently logged on.
    Dim username As String  ' receives name of the user
    Dim slength As Long  ' length of the string
    Dim retval As Long  ' return value
    
    ' Create room in the buffer to receive the returned string.
    username = Space(255)  ' room for 255 characters
    slength = 255  ' initialize the size of the string
    ' Get the user's name and display it.
    retval = GetUserName(username, slength)  ' slength is now the length of the returned string
    username = Left(username, slength - 1)  ' extract the returned info from the buffer
    ' (We subtracted one because we don't want the null character in the trimmed string.)
    Text1.Text = username
End Sub

I was referring to the other users on at the same time.