InfoPath Dev

Could someone please explain the xdocument set command in vbscript?
Here's an example:
Set txtOrg_By = XDocument.DOM.selectSingleNode("//my:txtOrg_By")

I want to make sure that I understand this statement and it's context for use so that I can apply it properly. Any suggestions would be greatly appreciated.

I'm not a big vbscript guy, but I pretty sure I can explain this statement.

Let's start with the right-hand side, like the compiler does. First we want to use the selectSingleNode() method of the DOM instance for the XDocument object to select a single node from the Main DOM of the form.

After this node is selected we want to store the result (which will be an IXMLDOMNode object) in a variable named txtOrg_by.

I hope this is what you're looking for, let us know if you need any other assistance!