What are you trying to accomplish and how does your code look like? There are places in Tobii Studio that grabs keypresses on a very low level, notably during recordings. I can’t say for sure that the SendKeys class act on that level. However, it somewhat depends on what you are doing. Tobii Studio does in general respond well to external applications manipulating it via faking user interaction. We have a lot of test suites that do exactly that, though we use a third party framework.
–Jesper