'example by Donavon Kuhn (Donavon.Kuhn@Nextel.com)
Private Const MAX_COMPUTERNAME_LENGTH As Long = 31
Private Declare Function GetComputerName Lib "kernel32" Alias _
  "GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Private Sub Form_Load()
    Dim dwLen As Long
    Dim strString As String
    'Create a buffer
    dwLen = MAX_COMPUTERNAME_LENGTH + 1
    strString = String(dwLen, "X")
    'Get the computer name
    GetComputerName strString, dwLen
    'get only the actual data
    strString = Left(strString, dwLen)
    'Show the computer name
    MsgBox strString
End Sub