Made a custom usb device

I made a custom USB device which was basically an alpha-numeric screen(16 x 2) connected with a PIC micro controller which in then connected with a computer through USB. The micro controller is coded with a custom firmware. The device is initialized with a TAB, then whatever is pressed on keyboard is displayed on the Alpha-Numeric screen and the device also send the next alphabet or number to the computer which can be seen on any serial terminal.