the one that application programs use, the syscall interface. That
interface is _very_ stable over time, and will not break. I have old
programs that were built on a pre 0.9something kernel that still work
-just fine on the latest 2.6 kernel release. This interface is the one
+just fine on the latest 2.6 kernel release. That interface is the one
that users and application programmers can count on being stable.