I'm assuming that you mean to add a comment to this article:
Multi-touch development with WPF - A multi-touch RSS reader[
^] You should use the "New Message" link in the Comments and Discussions section at the end of the article in order to ask the author a question. If you post it here, there is little chance that he will run over the question. If you ask in the Comments and Discussions, the author will get a notification and be able to respond to you. Cheers.