MS Word addin, macro or VBA script for passing word text to remote server, and displaying the response

I would like to create a button that the user can press on the MS wor开发者_如何学JAVAd toolbar, after this the document text is passed to a remote service, and some tabular data is passed back and displayed to the user.

Which would be the easiest an quickest for creating this? Can a macro do this? Or to display a button in the toolbar I must have an addin?

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Sure a macro can do this. Adding a macro button to your toolbar:

http://web.ticino.com/multilingual/creating_a_macro_button.htm

Passing data to a remote service - well, you did not mention the kind of protocol you have in mind, here is an example of how to post a http request by using VBA:

How can I send an HTTP POST request to a server from Excel using VBA?