Using this technique, it is possible to control conventional applications. Implementing and testing such solutions we found that they are often difficult to handle by the user, especially if the application program is slightly more complex and needs many different kinds of input information. Therefore we implemented a different solution - the indirect control of conventional applications. Using this method the software for analysing biological signals is connected to standard applications via a software program with a special user interface. One example of this category is a virtual keyboard to control a standard text editor.
Indirect control allows the user interface to be adapted to bio-signaling as an input device.
This makes the software easier to learn and operate. The keyboard on the left can be controlled by means of a bio-electrical gauge. The letter currently focused on is highlighted and then selected by being looked at for the time set. Changing to neighbouring letters is carried out by looking to the left, to the right, up or down. Letters are arranged according to their frequency in the German language to facilitate fast typing even for non-proficient users.