Hi Dave.
Thanks for the pointer. I wonder if there is a way to know the names of the .h files that I'm looking for.
I got "IBM TCP-IP 1.2.1 for OS2 (3.5)" and it has some .h files on disk #3. It has db.h, font.h, kbd.h, msgs.h, nameser.h, ns.h, nstat.h and tmp.h. But I'm not sure if those are for DOS or just for OS/2. Also, I guess the installer does something to those files, since are not txt files.
Regards