> I would still like to know
> what happens when the owner of one of those lists explicitly adds one of
> those keywords to the list header, and the setting conflicts with the
> setting in the .IK file. Will LISTSERV issue an error when the list owner
> attempts to PUT the list, or will it use some logical rule to determine
> which setting to use?

Neither. It works like a #include. The result is the same as if you had cut+pasted the .IK file into the list header. The keyword values are concatenated and what happens depends on the particular keyword.

  Eric