Problem with Environment.CommandLine routine.

I have an app that is controlled by a module to make sure it is only opened once. Now that works fine but the problem is if my app is open, and a command argument, Environment.CommandLine, is sent to it, nothing happens. The code below just shows the Module to open my app.

(Thanks to Yzlat for the following code)
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Module monitor
    Sub main()
        Dim bAppOwnership As Boolean = False
        Dim sAppName As String = "Local\" & Reflection.Assembly.GetExecutingAssembly.GetName.Name
        'Return value - contains true if the calling thread was granted initial ownership of the mutex.
        Dim bAppFirstInstance As Boolean
        'Static ensures the mutex is not garbage collected until the application is unloaded
        Static m As System.Threading.Mutex
        Try
            'Create mutex
            m = New Threading.Mutex(bAppOwnership, sAppName, bAppFirstInstance)
            'If this is the first instance of the mutex, then run the application
            If bAppFirstInstance Then Application.Run(New frmConfig)
        Catch ex As Exception
            'error - display a system modal error message box
            MsgBox(ex.Message, Microsoft.VisualBasic.MsgBoxStyle.SystemModal Or Microsoft.VisualBasic.MsgBoxStyle.Critical Or Microsoft.VisualBasic.MsgBoxStyle.OKOnly, _
            Application.ProductName & " Is Unable To Start. ")
        Finally
            m = Nothing
        End Try
    End Sub
End Module
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Any ideas?