handle array: An array of object handles that are sent to and received from a server as part of a remote procedure call (RPC) accompanying ROP request buffers and ROP response buffers, respectively. Also referred to as a Server object handle table or an HSOT table.
hard delete: A process that removes an item permanently from the system. If an item is hard deleted, a server does not retain a back-up copy of the item and a client cannot access or restore the item. See also soft delete.
header: (1) A line, or lines, of content in the top margin area of a page in a document or a slide in a presentation. A header typically contains elements such as the title of the chapter, the title of the document, a page number, or the name of the author.
(2) A name-value pair that supplies structured data in an Internet email message or MIME entity.
header field: A component of a Session Initiation Protocol (SIP) message header, as described in [RFC3261].
header row: (1) A row in a table, typically the first row, that contains labels for columns (2) in the table.
hierarchy synchronization: The process of keeping synchronized versions of folder hierarchies and their properties on a client and server.
Hypertext Markup Language (HTML): An application of the Standard Generalized Markup Language (SGML) that uses tags to mark elements in a document, as described in [HTML].