finger contact on the left side of the mouse. Thus a right-click requires lifting the finger off the mouse, then right-clicking. This also means that the Mighty Mouse cannot support mouse chording, used by CAD software, games, and other applications where multiple functions are mapped to the mouse. Technical features Touch-sensitive top shell Trackball Force-sensing side "squeeze" areas Optical (LED) tracking (wired version) Laser tracking (wireless version) Compatible with Macintosh, Windows, and Linux PCs Programmable functions for the four "buttons" Auditory feedback with built-in speaker Criticism Although the Mighty Mouse can sense both right and left clicks, it is not possible to press both sensors simultaneously. The user must learn to lift the left finger off the sensor surface before attempting a right-mouse click. The scroll ball will eventually become clogged with dirt and require cleaning. While there are methods to clean the ball without dismantling the mouse some users have complained that the Mighty Mouse is difficult to clean because the scroll ball mechanism is hard to take apart. Name Prior to launching the device, Apple received a license to the name "Mighty Mouse" from Viacom, and subsequently CBS Operations, as owner of the Mighty Mouse cartoon series, the title having been registered in the US as a trademark with respect to various merchandise (such as T-shirts and multivitamins) associated with the character. However, the trademark did not cover computer peripherals, and CBS did not apply to trademark the term in the US with respect to computer mice until mid-2007. On May 21, 2008, it was announced that Man & Machine Inc., a supplier of keyboards and mice to laboratories and hospitals, had sued Apple Inc. for trademark infringement over its use of the name Mighty Mouse. Man & Machine Inc. had four registered or pending trademarks on various computer pointing related technologies, including "Cool Mouse", "Really Cool", and "Man and Machine and Design". The particular Mighty Mouse trademark in dispute was first filed by Man & Machine Inc., on December 18, 2007, with the description "Computer cursor control devices, namely, computer mice"—after CBS's filing, but claiming first use in 2004, before the introduction of the Apple device. There also was another scroll mouse named Mighty Mouse developed by NTT and ETH Zürich in 1985. Following opposition proceedings on both sides against the other, CBS subsequently withdrew its application, allowing Man & Machine to register the US trademark for