PMDF System Manager's Guide

Some special option files may be associated with a channel that describe how to trim the headers on messages queued to that channel. This facility is completely general and may be applied to any channel; it is controlled by the headertrim, noheadertrim, headerread, and noheaderread channel keywords.

Various PMDF channels have their own channel-level option files as well. Header option files have a different format than other PMDF option files and thus a header option file is always a separate file.