>AFAICR there is also a much more rarely used ***DATA***
>path feature available somewhere in the dark arcanery
>of the MSDOS world.

NO - that is what myself, and at least one other said, while individual
programs may have used such a variable to define where to find data files,
this HAS NOT been a specific feature of MSDOS, and had to be programmed into
the application to find the variable, and search the paths it found therein.

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