Userdefined functions for the six keys above and underneath the Touchpad of the Elitebook 8570 W

Is it possible to configure  the six keys above  and underneath the Touchpad of the Elitebook 8570 W with own commands as for example "Page down" or "Page up".
The Synaptics driver (version 19.0.19.65) offers only little choice. There are the three mouseclicks and navigate foreward and backward. Obviuosly some programs have access to the driver, the is written "In some applications special functions= (translated from German). With tose six keys I could improve my work wonderfully, if I could use userdefined commands - The Elitebook 8570 w has printed the word "Workstation" in big letters on it´s backside...