Hi @f3head, I am afraid that for the time being, the Tobii Core App does not support receiving virtual key pressed.
Googling around, I came across this page on stack overflow @ https://stackoverflow.com/questions/39809095/why-do-some-applications-not-accept-some-sendkeys-at-some-times
Perhaps you could try this approach of using a Hardware Scan Code with your software? Try it out and let us know how you get on. Best Wishes.