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Message: [QUOTE="Walter Roberson, post: 2491460"] My recollection from <mumble> years ago is that it has logical disks (not the right term, I know) that are often internally defined as cylinder groups on physical disks, and that the logical disks can be associated with a letter, and that a file designation by a user is by a two part name (the second part of which may be associated by tradition with a particular file "type") followed by the letter... e.g., HELLO TEXT Z designating file HELLO TEXT on the cylinder group currently associated with the letter Z. Once a letter was associated with a cylinder group, the user could request a listing of contents, with at least some level of wildcarding. If the above is still the situation in z/OS then I would say that z/OS -does- have directories within the definition given by Malcolm -- a grouping of files that does not include all that are physically readable on the system. There might not be any master directory, and other than drive A you might have to peak through people's PROFILE to figure their default file set... and you'd miss all the dynamic associations... And it doesn't use a cross compiler. It very [/QUOTE]