Next: Control Instructions
Up: The Instructions
Previous: Equality
pop simply removes the top stack element. This instruction is
only used in non-functional programs, e.g. in loops, where the
result of the loop body is simply discarded.
remove removes 
elements from the stack, except the topmost
one. This instruction is used at the end of a let statement
where the local variables have to be discarded.
dup duplicates the 
element of the stack. This is used to
push a function argument or a local variable (as an operand) on the stack.
set-nth replaces the 
element with the top stack element. This
instruction is used for assignments (e.g. via setq).
The set-nth- instruction additionally removes the top stack element
(see section 6.3).
