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Laszlo Danielisz wrote:

> Great Mike,
> May I ask what is ABI?
> 
ABI is short for Application Binary Interface, and is a low-level interface 
between programs and the operating system [kernel] they run on.

You may have seen API as well - short for Application Programming Interface. 
This generally/usually is relevant to programs talking to other programs.

In FreeBSD, if changes to the ABI are deemed necessary, this will generally 
serve as a demarcation point between one major version revision and the next 
one coming along, e.g 7.x, 8.x, 9.x, and so on.

-Mike