Computer-aided design (CAD) software, computer-aided manufacturing (CAM) software, and computer-aided engineering (CAE) software is used in mechanical, electrical or electronic design; simulation, drafting, and engineering; and analysis and manufacturing. CAD, CAM, CAE and design software runs on mainframes, general-purpose workstations, and personal computers (PCs). Common operating systems include Microsoft Windows, UNIX, Solaris and SunOS. Microsoft and Windows are registered trademarks of Microsoft Corporation. UNIX is a registered trademark of The Open Group. Solaris and SunOS are trademarks of Sun Microsystems, Inc. CAD, CAM, CAE and design software that run on proprietary operating systems or requires specialized hardware is also available.