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A general facility was provided for constructing a subprocess from a
description in a given file. This description contained such
information as entry point address, size of a scratch file, names of
files to be used in map entries, etc. Various conventions were used to
determine in which directory to look up a name.
A special case of this facility accepted as input a subprocess
descriptor (as described in chapter 10, ``The Disk/Directory
System''). The command processor had had access to the action which
converted the descriptor to a directory. The command processor then
looked up a special name in the resulting directory, obtaining a file
which it processed as above.