Newer iBook, PowerBook, MacBook and MacBook Pro can be scrolled through simply by using an extra finger on the trackpad. This feature is not available from Apple before the 2005 laptops shipped. Now you can add this feature to many older Apple laptops.

Daniel Becker’s iScroll 2 0.27, free (make a donation if you like it) adds two-finger scrolling support on most of Apple’s PowerBook G4 and all iBook G4 models introduced from 2003 to 2004. iScroll, download is available from sourceforge.net, is based on Apple’s AppleADBMouse driver, which was written for the Apple Desktop Bus-powered trackpads found on older Apple laptops. This code was then released via Apple’s Darwin project and has since been rewritten to support newer laptop models.

iScroll 2 requires Mac OS X 10.3.8 or later and a 2003 aluminum PowerBook or iBook G4 to run. Models that are known not to be supported include all G3 and Titanium PowerBooks, the very first 12″ PowerBook model, all G3 iBooks, and all newer machines that come with two-finger-scrolling built-in: The trackpads of the older machines simply lack two-finger detection capabilities completely, whereas the models that have scrolling built-in use a completely different, USB-based trackpad, the driver for which is not available as open source.

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