You can't do this in standard C, so find an external library that will do what you want and, if you have trouble with that library, you'll surely get better help by asking the people who maintain that library. If it's the DOS C library that you want to use (conio.h is an interface for a library by that name, right?,) you probably won't find people who maintain it since they're all dead, so you might get help if you send mail to the Big Indian, who's also known as Yashavant Kanetkar.
But yeah, the Windows programming and 'Linux' programming boards could sure use a lot more posts. Maybe a Conio programming board would work if the Windows programming board isn't quite relevant, and it might attract some Spanish programmers too.
