FD (File Description)

The descriptor FD identifies a file. If a link name (LINK) exists, the associated file is processed. Any additional file name (NAME) specified for FD is ignored. LMS enters in the NAME field the file name associated with LINK. If no link name exists, the file identified by NAME is processed.

Field	Meaning	Length in bytes	Contents after initialization
PASSWORD	Password as per PASSWORD command	4	4 x X'00'
LINK	Link name	8	8 x X'40'
NAME	File name	54	54 x X'40'

The descriptor FD is required in the ADD and SEL functions.