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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.
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