I think he wants to start a Windows application using command line arguments. In that case he could try this
Dim arg As String()
arg = Environment.GetCommandLineArgs()
For i As Integer = 1 To arg.Length - 1
Select Case arg(i).ToLower
Case "a"
Case "b"
Case "c"
Case Else
MessageBox.Show("Unknown argument " & arg(i) & ". Programm starts without arguments", "Oops")
End Select
Next