The purpose is not to be "hidden" the key for further use (since external application supporters are often connected via teamviewer e.g., but cant be "supervised" all the time) if an "error" occures e.g. after install of application "x" there is at least the possibility to get a hint what was changed last, when you ask people there is always "I didnt do anything" ;-) ...
I dont want "a viral keylogger" ;-) its no problem when there is a "taskbar icon" or something it just has to do the job ...