Hi @kseniia and thanks for your query. There are a number of solutions you could possibly go with. The simplest might be to consider that with the Consumer level of eye trackers we sell (4C, EyeX) come already supported within Windows for direct interaction using built-in software, so if the program you intend to create is suitable for eye trackers (ie large buttons, etc) then you could start using the eye tracker straight away without further modification. Depending on your budget and timeline, this might be something to consider.
The next level of course would be designing your own software and indeed you will be pleased to hear that we do offer a consultancy service for this!
I have sent you a PM with further contact instructions to pursue this route. Best Wishes.