The directories here contain `exploded' UNIX distributions, so that you can access individual files easily. This saves you from having to extract them from the original distribution. However, in some instances files and directories have had their permissions changed, to allow browsing regardless of user-id or group-id. File ownership has been kept intact in the on-line version, but may have default values on a CD-ROM distribution. Consult the original distribution for correct permissions. V6 comes from the files in Distributions/research/Dennis_v6 V7 comes from the files in Distributions/research/Henry_v7 2.11BSD comes from the files in Distributions/ucb/2.11BSD The V7 directory has been modified to include the vt client used by the virtual tape server in Tools/Tapes/Vtserver.