I am interested in trying out a program called Calc2Key, which allows you to use your calculator as a keyboard. It is written in C++, so I thought I should just be able to compile and run, but I received an error right away because I did not have the windows.h header file. I discovered that I would need the Win32 API, but I am not sure how to implement this, or if it is even possible to use the program on an OS other than Windows. Just for clarity, I am using the latest release of Ubuntu. If anyone could help with this, it would be great!

There's a slim chance that it might work under Wine, but you'd probably have to rewrite it in terms of Linux APIs to work on Linux- using uinput or something.