This provides extra information about the object.
Its format is undefined at this level - it has significance to higher-level
application software. Object descriptors are arrays of bytes of any value,
maximum length 255.
In Acorn Access+ the descriptor for type Discs indicates whether a disc is
shared protected or unprotected, or as a CDROM or subdirectory, and visible
or invisible to other desktop users.
The descriptor for type Printers is a 'Printer Type' string.
The descriptor for type Hosts is null.
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