Controling Dynamic Input Fields - webbrowser - VB.Net forms

Question

I have VS 2008 and am working in VB.Net forms.

I have a webbrowser control where I am trying to control input fields that are dynamically created. If a text field has proper handles such as id and name tags there aren't any problems.

For example, I am trying to work with twitter for posts. I know twitter has an API but I want to work with many similar systems and want to avoid the API as its case specific and I want to scale things within the VB.Net form. The login fields for twitter are easily handled, however the posting field once your logged in is just a text area with a class. There is a tagname but I have been unable to post using the tagname element.

Any examples of posting to twitter without the API ?

web1.Document.GetElementById ... ?
web1.Document.GetElementsByTagName ... ?

I've done extensive searching but can find nothing to make it happen. DOM inspectors havn't revealed much about the field.

Thanks.