The GENERIC kernel on FreeBSD X includes compatibility with FreeBSD X-1 (where X can be 7, 6, or 5), with compatibility going all the way down to FreeBSD 4 binaries. This means, you can run binaries compiled for FreeBSD X-1 on systems running FreeBSD X. All you have to do to make it work is install the compatYx port (where Y is the version you need compatibility for).
For example, if you are running FreeBSD 7.0, and you need to run binaries for FreeBSD 6.x, then you would install the compat6x port.
IF you need to run FreeBSD 5.x binaries on FreeBSD 7.0, install the compat5x port. And the same for FreeBSD 4.x binaries (compat4x).
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