For a computer keystroke recorder to do its job well enough to be of any service to those who use such software tools, it need to remain hidden and unseen by anyone using the computer that it's installed on, right? This might seem to make clear and common sense, but you'd be surprised how many software tools just don't make use of this all important aspect of monitoring computer activities.
After all, if you really want to see what's going on naturally while you aren't around, then you need to know that any indications that such a tool is present on your computer (such as any unfamiliar desktop icons or symbols in the computer's system tray or task bar) is going to make things obvious to any user and they won't be acting naturally as a result.
So obviously, a computer keystroke recorder shouldn't have any such indications visible that it exists on the hard drive at all, plain and simple.
To illustrate, let's say you suspect your spouse of cheating on you and hope to find some sort of proof to use in confrontation - if your partner sees something that alerts him or her to the fact that you are monitoring the activities on that computer, are they going to do anything that they don't want to get caught doing? Certainly not, and that's precisely why you need a tool like this to do its work in an invisible manner.
You need it to run without the need of icons, automatically as soon as the computer's power is switched on, hide all that's recorded in invisible files and have it all be sent to your e-mail periodically for you to see in private from any computer available.