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If you don't want to go into details then go directly to section Find the input_keycode and output_keycode for a particular keysection Key type events though it will be a good idea to get some understanding.

The journey of a key

When a key is pressed on the user keyboard, before it reaches its destination and displays a key output on the user VM, it passes through the browser the client uses, the client OS, the console proxy, the server side hypervisor, host OS, and displays a key on the VM. Even when console proxy does the key translation correctly according to the standard and keyboard layout, any component in this path can change the key translation, hence it can make the key output at the end user VM incorrect. 

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