> 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