A scrolling device for a computer may include a touch-sensitive surface, which may be elongated and/or have one or more active regions. Scrolling may be performed in manual as well as automated ways that may result in more accurate and efficient scrolling. Scrolling, as displayed on the screen, may further...http://www.google.com.hk/patents/US6707449?utm_source=gb-gplus-share專利 US6707449 - Manual controlled scrolling
