Does Your Code Think In Ink? is a contest to develop your best PowerToy for the Windows XP Tablet PC Edition. A Tablet PC is not even required to enter.
“The Tablet PC Platform SDK application development can be done on a standard Windows XP desktop. The SDK provides the Tablet PC pen and ink runtime DLLs and APIs. In addition, the SDK offers documentation and samples to assist you in integrating pen and ink components into existing and/or new Windows applications.”