9 Portable and folding keyboards for use with handheld computers; computer operating system software to operate portable and folding keyboards for use with handheld computers; handheld computers, personal digital assistants, and components and peripherals of these, namely, keyboards, computer screens, stands, styli and other input devices; computer operating system software to operate handheld computers, personal digital assistants, and components and peripherals of these, namely, keyboards, computer screens, stands, style and other input devices; portable and folding computer screens for use with handheld computers; computer operating system software to operate portable and folding computer screens for use with handheld computers; carrying cases for handheld computers, personal digital assistants, components and peripherals of these, namely, keyboards, computer screens, stands, styli and other input devices; carrying cases for portable and folding keyboards and portable and folding computer screens for use with handheld computer