If you have a Macintosh laptop manufactured after January 1, 2005 then you probably do. If you have a Thinkpad manufactured after 2003, then you probably do. If you have a HP laptop was produced since January 2007, you may have a 3D Motion Data Protection System. If you have an Acer laptop produced since January 2007, you may have a Gravisense accelerometer on board. Soon we may have a web-based open-source program to tell you whether your laptop has an accelerometer or not.