实现pda键盘硬按钮的屏蔽，将弹出窗口代码去掉即可-Pda keyboard buttons to achieve the shielding hard to remove the pop-up code can be

自定义无任何操作痕迹的安全输入键盘，屏蔽系统键盘，且实现数字的动态显示，每次弹出键盘显示数字顺序不同。-Custom safety signs without any operation input keyboard, keyboard shield system and dynamic digital display, each pop-up keypad display different numerical order

VB屏蔽所有键盘按键,做屏保用，做实时上传用防止人为操作(VB screen all keyboard keys)