[VB2010] Type/read from online document (GoogleDocs)

The idea was, to create a program that would type into GoogleDocs, and read from it, thereby creating a " chat ".
Now, I'm not exactly how to do this, what I've tried so far, in terms of typing into it is:

Code:

---

    Dim W As IO.StreamWriter
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSendMessage.Click
        W = New IO.StreamWriter("GoogleDoc Link Here")
        W.WriteLine(TxtMessage.Text)
    End Sub

---

Which obviously doesn't work, as it's meant for local paths on the pc. Could you create a file that would reach this website to, create a shortcut of some sort?
How can I do this?

You can't just open a file on the internet and read and write it the way you can a local file. If you want to read a file on the net then you have to download it. If you want to write a file on the net then you have to upload it. Conducting a chat by uploading and downloading files is rather impractical.