Thanks for your reply.
As I understood in "USB Generic HID Reference Application" project, you can communicate with your hand made PCB. So you implemented also a firmware which connect your PCB to your reference application.
In my project I have a programmed PCB and also a firmware (like a driver for a hardware) which already has installed on my laptop. Now, I can communicate with my programmed PCB via Tera Term (http://ttssh2.sourceforge.jp/
I tried to just replace the VID and PID of my special PCB on your reference application to communicate with my PCB. But it did not work. The question is: which part of your project do I need change for communicating with my own PCB? How can I use the installed driver (firmware) in your reference application?