1. A method for collaboratively commenting via a thin client application, the method comprising: receiving a document; receiving a request from a thin client application to view the document; sending an image of the document to the thin client application; and sending one or more comments and information that associates each comment with a location in the document where the comment is anchored to the thin client application, the comments and information sent in an extensible markup language (XML) file, such that a selectable control representing the location of a comment is displayed at a location near the location of the anchor as a hypertext markup language (HTML) overlay over the image of the document.