POPLOG - U Sussex. Language for the two-stack virtual machine (PVM) which
underlies the POPLOG interactive environment. POPLOG supports POP-11,
LISP, Prolog and ML via shared data structures and incremental compilation.
"POPLOGs Two-Level Virtual Machine Support for Interactive Languages", R.
Smith et al, in Research Directions in Cognitive Science, v.5 (1992).
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