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+Notes to assist in debugging pmie
+
+pmie command line debug flags
+    APPL0	- lexical scanning
+    APPL1	- parse/expression tree construction
+    APPL2	- expression execution
+
+macro EVALARG(x) expands to
+    if ((x)->op < NOP) ((x)->eval)(x);
+
+The source file fun.c is generated by expansion of all of the *.sk
+"skeletal" files ... so changes need to be made in the *.sk files and
+fun.c will be recreated in the make.
+
+The Expr structure (defined in dstruct.h) is at the core of the pmie
+expression evaluation.
+    valid	must be > 0 for there to be any values able to be
+    		used in the expression evaluation
+