Header

1. The portion of a packet, preceding the actual data, containing source and destination addresses, error checking and other fields.

2. The part of an electronic mail message or news article that precedes the body of a message and contains, among other things, the sender's name and e-mail address and the date and time the message was sent.

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HDM HDSL HDTV hdx Head Disk Assembly	Active Reconfiguring Message addressee Application Protocol Data Unit BITNET Blind Carbon Copy	Head Normal Form head normalisation theorem heads down head-strict heap