A document accessible on a network may be opened by multiple users. A user may use a thin client application to access the document, wherein an image of the document and XML data including comments and locations of the comments in the document. Hint icons are displayed in the document where comments are anchored. Upon selection of a hint, an HTML comments pane may be displayed to a side of the document, exposing comments and replies to comments currently stored in the document. The comments pane may be scrolled to the comment associated with the selected hint. Additionally, highlighting may be provided over elements in the document associated with a selected comment. Comments may be added via the comments pane and saved to the document on the network. Comments and comment location data may be communicated to other clients, allowing for collaborative communication via a thin client application.