Good job Mark.

I've seen a couple of newcomers recently struggling with the FMC. This thread is for them.

Strangely I was just reading a Boeing manual on the FMC and came up with this little tidbit.
There are some hidden pages in the real FMC, I wonder if they made it this far??
You can try;Lateral Offset page (Is it there??) and bring this up on both CDU's. Enter any offset but DO NOT execute. [This is where it won't work, I think] Hit enter on both CDU's simultaneously.

If you can find a way to hit enter on both CDU's at once it might just work.

From what I can see the "Offset" page is available on FMC's using software rev U7 and up.