说明：  dos下控制键盘，The PCKey class provides access to the PC s keyboard through fast inline member functions. Special characters are defined in the header for your convenience. PCKey is not for use in Windows programming -- use only for DOS applications!
(dos under control keyboard, The PCKey class provides access to the PC's keybo ard through fast inline member functions. Spec ial characters are defined in the header for you r convenience. PCKey is not for use in Windows pr ogramming-- use only for DOS applications!)