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Message: [QUOTE="CBFalconer, post: 2491502"] You obviously never used either ZCPR or my DOS+ system. Both had DU addressing, whereby the file location could be described as "B8:filename.typ", for example. My CCP+ (not sure about ZCPR) had paths for executables, and (memory hazy) possibly for data. CP/M2.2 documentation claimed that any user could execute programs with the sys attribute in user area 0, but it didn't do it. DOS+ did. Together with the executables path, and the extension to loading executables from COMMAND.LBR, this allowed much to be packed into a small space and fairly good control of user capabilities. [/QUOTE]