The opportunity to generate money online is in the hands of every computer user every day. Twenty years ago, nobody would have thought that a single click of the mouse would one day become the most important key figure on the Internet. The mouse click as a navigator not only guides users through the vast space of the Internet, it has also become the universally accepted 'currency' in e-commerce, because on the one hand it at least signals 'interest', and on the other hand it even enables purchases to be made. Almost every interface on the Internet is now operated intuitively with the mouse. This will continue to be the case until the further development of speech recognition software could even relieve us of this tedious manual work ...