DSXchange

Several of the environment variables that PX uses start with the prefix 'APT'. This stands for Applied Parallel Technologies.. the name of the company that originally built the PX Engine. Applied Parallel Technologies became Torrent Systems, and then Ascential bought Torrent and turned Torrent's Orchestrate product into Ascential's Parallel Extender.

- BP

This, of course, is why some of the function names (that sometimes appear in log messages) include "ORCH" - it's from Orchestrate.