While it's most natural for those with a software orientation to analyze "process control" as a label for what open and exec, for example, do, it's most common in the larger world to gloss the term as the "engineering discipline that deals with ... mechanisms ... for controlling ... a specific [physical] process." [L1 ]. Tcl'ers with interest and experience in process control include: Steve Offutt; KBK; Gerald Lester; CL; Philip Quaife; De Clarke; Steve Redler IV; ...
Also see this [L2 ] entry to a Wiki focussed on process control with dynamic software.