Reader feedback
Feedback from our readers is always welcome. Let us know what you think about this web site, what you liked or may have disliked.
Reader feedback is important for us to develop content that you really get the most out of. To send us general feedback, simply send an e-mail to
and mention the section or title via the subject of your message.
Downloading the example code
You can download the example code from Download section.

Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you find a mistake on our web site - a mistake in the text or the
code, we would be grateful if you would report this to us. By doing so, you can save other readers from frustration and help us improve the quality of this page.
If you find any errata, please report them by sending an email to info@topal.ch and entering the details of your errata. Once your errata has been verified, your submission
will be accepted and the errata will be uploaded to our website, or added to any list of existing errata, under the errata section of that title.