A named block can be used to hold any data for any purpose; for example, named blocks can be used to store
Internal mark data
Public mark data
Group information
Selection operations criteria
Access control data
A named block is a block of data that is referenced by an 8-byte name. The data is structured as follows:
8 bytes = name of named block
4 bytes = size (n) in bytes, of named block data
4 bytes = reserved. Only present and necessary with Intel 16-bit format.
Skip on read and write as zeros.
n bytes = named block data