This is a simple virtual piano. It cannot be played by the keyboard. You have to play it using the mouse.

在触摸屏中实现虚拟键盘，进行数字输入.一般应用在工业计算机触摸屏使用。-Implement a virtual keyboard on the touch screen, digital inputs for general application use in industrial computer touch screen.

地震segd格式数据道头信息显示，波形显示，俄罗斯dmng公司(Seismic SEGD format data channel head information display, waveform display, Russian DMNG company)