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OS/400

OS/400 simple names may have a maximum of ten alphabetic characters: the first character must be alphabetic or a special character such as ‘@’, ‘$’, or ‘#’. Embedded blanks are not allowed. This restriction applies to object names, member names, format names, and field names in CL, command source, and DDS. The names of OS/400 objects, folder, and document names may also contain an embedded period; for example ‘FRED.DOC’.

The user profile names used in networks should be eight characters or less, as some other architectures only support eight-character names.