from Apple presented a mouse prototype with a horizontal thumb-wheel for scrolling, or for navigating inwards and outwards: zooming or along the third axis in 3D space. In her patent application from 1992 there are two vertical wheels: left and right of the button(s). Jack McCauley claims to having developed another mouse prototype at about the same time, also with a top-mounted wheel for a navigating inwards and outwards. In 1995, the Taiwanese company KYE Systems released the first commercial mouse with scroll wheel. It was named Genius EasyScroll and was also available as Mouse Systems ProAgio. The scroll wheel was popularized by the Microsoft IntelliMouse in 1996 along with support for the mouse wheel in Microsoft Office 97. It had been based on ideas developed by Eric Michelman since 1993 with input from Chris Graham. Scroll wheels can also be found on such handheld devices such as PDAs, or mobiles phones such as early Sony models and BlackBerry devices. They have also appeared on keyboards, particularly on Logitech and Microsoft models, usually located to the left of the caps lock key. Alternatives Instead of a scroll-wheel, some mice (and other devices) use an alternative but similar component. Laptop computers often include a touchpad programmed with a pointing device gesture that mimics a scroll-wheel (either by dedicating an edge of the pad for scrolling, or activating scrolling through a multitouch gesture). Many Linux distributions offer a method of scrolling using the touchpad where the user will first activate scroll-mode by pressing in a corner of the pad, and then dragging in a circle around the center of the pad; letting go of the touchpad will switch back to the default mouse-mode. In mice, alternatives include scroll balls (similar to trackballs, such as on Apple's Mighty Mouse and some serial or PS/2 mice, which combine horizontal and vertical scrolling), pointing sticks, integrated touchpads (as on Apple's Magic Mouse) or optical sensors. Unusual examples include a joystick-style hatswitch present on an early Saitek mouse, and a central 4-way switch-pad found on the Cherry Power Pad Mouse M-1000. Genius also offered the simpler NetMouse in the late 1990s, which had a two-way rocker switch instead of a wheel, marketed as the Magic Scroll Button. Some ThinkPad laptops allow scrolling using the pointing stick by holding a button above the touch pad. Other applications Scroll-wheel motion is often used to control other aspects of