This is a situation that I found at work: I use KMail and my co-workers use Thunderbird. We use a shared e-mail account and, when they reply to a message, I can see it as replied, but when I reply to a message from KMail, only KMail can see it as replied.
You can imagine where the problem may be and, after a little research, this is what I found.
As a probe of the use of kprobes for Extension of Operating Systems I have made a Linux module that allows you to execute a command for every pressed key and see its keycode.
It includes some sample scripts that can be used as the command to be executed on every key pressed, these scripts are:
Registers every pressed key in a file.
If framebuffer is enabled it allows doing a console screenshot using print screen key.