Purpose Built Software (PBS) are 20 year veterans writing software for mobile devices. We were around when plain vanilla DOS got fancy with DOS-Graphics; saw the evolution of Microsoft Windows, Palm OS, PocketPC, WindowsCE, WindowsMobile and others. We were early adopters of all of them; needed to be to stay ahead of the game and provide guidance to our clients.
Thru it all we have engineered to keep programs viable with latest mobile and desktop hardware and operating systems while maintaining backward compatibility. This is not trivial R&D. Solid engineering has allowed our clients to use old and new hardware in a mix'n'match fashion without re-writing programs.