Which ones? There is one that will cause a C0000005 error (intentionally) and a few other internal uses but I don't remember the numbers. As with the SETS, I went through them piece by piece to straighten out the docs for VFP 8 but I don't recall any issues.

SYS(12) and SYS(17) are kinda useless. I filed an enhancement request to make SYS(17) more useful for VFP9 but it fell by the wayside as the API call for this info returned a STRUCT that could be parsed by other means.

>>Almost all of the old SETs still do work. I was on a project with the documentation folks back in 2001/2 to straighten up the VFP docs and I remember testing the heck out of all of the SETs. I think SET DOHISTORY doesn't work anymore but most of the others still do.
>>
>What about the "unknown" sys() functions?