>>Y2KFOX from Netlib is such a product that alters the behavior of native functions like CTOD().
>
>Sure, that it can hook into CTOD(), or does it only hook into API calls, like eg http://www.hook-api.com/.

Well, but Win API functions are simply C functions. Does the vfp runtime differ in that respect? Is it possible to DECLARE functions of the VFP runtime, like you can DECLARE Win API calls? Then their technique should work in DOS too, shouldn't it? http://www.hook-api.com/api-hooking.html

Maybe netlib is not bending calls at that IAT/EAT level but intercepts at a more vfp specific level like you said. As they say every DLL has such adress tables it should be possible to overload functions.

Bye, Olaf.

PS: Sorry, that should have been a reply to Christofs reply, not to myself...