I am a software developer for some companies, and we have included as part of the test installation keylogger software, as well as mouse clicking software, because with out this log of information we found that humans have no clue as to the path that was used to create a problem in the software. So this a very very legitimate use of the keylogger software, and mouse clicking software when the tester, is running our program. Other times I have used keylogger, and mouse clicking software on a customer's computer just to diagnose an issue the customer was having, and found that some one on the cleaning crew was using the computers as a gaming network, the company was unaware of this activity until I installed this invisible software on their computers with their permission. When everything settled down, then I was paid to remove the keylogger, and mousing logging software.