Reading current window from windows service

Hi - my code below runs ok as a windows form - but when I change to a service, 
it does not appear to be able to read the window name which has focus.

Is a windows service able to read the GetForegroundWindow() function?

Thanks, Mark

Imports System
Imports System.Configuration
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Text
Imports System.Runtime.InteropServices
Imports System.Security
Imports System.Security.Principal.WindowsIdentity
Imports dtmonitor

Public Class Service1
     _
        Private Shared Function GetForegroundWindow() As Integer
    End Function
     _
    Private Shared Function GetWindowText(ByVal hWnd As Integer, ByVal text As StringBuilder, ByVal count As Integer) As Integer
    End Function

    Protected Overrides Sub OnStart(ByVal args() As String)
        Timer1.Enabled = True
    End Sub

    Protected Overrides Sub OnStop()
        ' Add code here to perform any tear-down necessary to stop your service.
    End Sub

    Private Sub Timer1_Elapsed(ByVal sender As System.Object, ByVal e As System.Timers.ElapsedEventArgs) Handles Timer1.Elapsed

        Const nChars As Integer = 256
        Dim handle As Integer = 0
        Dim Buff As New StringBuilder(nChars)
        handle = GetForegroundWindow()
        Dim winnamelocal As String = ""

        If GetWindowText(handle, Buff, nChars) > 0 Then
            winnamelocal = Buff.ToString()
        End If

        Dim un As String = GetCurrent.Name
        Dim i As Integer = GetCurrent.Name.IndexOf("\")
        If i > 0 Then
            un = un.Substring(i + 1, un.Length - i - 1)
        End If

        Dim tme As DateTime = DateTime.Now
        Dim secs As Integer = DateDiff(DateInterval.Second, dtmonitor.My.MySettings.Default.curtime, tme)
        Dim tsDiff As New TimeSpan

        
        Dim fs As New System.IO.FileStream("c:\mtWindowsService.txt", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write)
        Dim m_streamWriter As New System.IO.StreamWriter(fs)
        m_streamWriter.BaseStream.Seek(0, System.IO.SeekOrigin.End)
        m_streamWriter.WriteLine("name: " & un)
        m_streamWriter.WriteLine("window: " & winnamelocal)
        m_streamWriter.WriteLine("tme: " & tme.ToString)

        m_streamWriter.Flush()
        m_streamWriter.Close()

    End Sub


End Class