Abstract: A method for preventing BadUSB attack from an external USB device to a host computer is disclosed. The method includes the steps of: a) obtaining a device description from a USB (universal serial bus) device; b) judging if the device description is reasonable; c) loading a driver for the USB device when yes in step b); d) filtering a command from the USB device after step c); and e) disabling the USB device when no in step b) or the command filtered in step d) is malicious.

Abstract: A method for inputting text to a handheld computer by way of using the keyboard on a personal computer connected thereto. The method includes the steps of: a) establishing an ADK connection between a handheld computer and a personal computer with a keyboard; b) opening a WINDOWS input mode under an editing mode in the personal computer; c) inputting text and/or symbols by using the keyboard and the WINDOWS input mode; d) converting the text and/or symbols into a format acceptable by the handheld computer; and e) transferring the converted text and/or symbols to the handheld computer.

Abstract: The invention provides a method for changing a touch control function when a smartphone is connected to a computer with a touchscreen. The method includes the steps: a) operationally connecting the desktop computer to the handheld touchscreen computer to project a screen picture of the handheld touchscreen computer on the touchscreen, wherein the screen picture contains a first item, and a second item corresponding to the first item is shown on the touchscreen; b) pressing and holding the second item for more than one second; c) sending a touch event about the operation to the second item from the desktop computer to the handheld touchscreen computer; and d) performing a pressing-and-holding operation to the first item by the handheld touchscreen computer according to the touch event.