...
is implicitly accessed by many immediate compiling words, especially
with IF THEN ELSE BEGIN REPEAT and other control words,
and also by LITERAL and SLITERAL since the CS-STACK is actually
the same as the normal Parameter Stack Pointer SP in PFE. As with the
Forth Standards, the CS-STACK could be a seperate stack which
is very useful with a Forth Assembler. Since PFE is fully written
in C and intends to be fully portable, there is hence no such need.
reference: CS_minus_STACK in doc-pfe.cdoc:0058, export never CS-STACK