Microsoft updated the Web site for its secretive Origami Project on Thursday, offering a more elaborate tease, but also confirming key details about the Windows-based mini tablet. Right-clicking outside the flash animation of the main Web page and viewing the source code provides this: ##"Origami Project: the Mobile PC running Windows XP."## Although Microsoft continues to play somewhat coy, sources have provided a pretty clear picture of the mini-tablet devices. They will carry Microsoft's software, but be made by several other companies, sources have said. They will also be larger than a typical handheld computer, with at least some of the devices using a roughly 7-inch screen.