Adds a thing to the front of a stack whose name is
This variable must have a list as its value; the initial value should be the empty list. New members are added at the front of the list. Later, you can POP value off the stack.
MAKE "mystack  PUSH "mystack 1 PUSH "mystack 2 SHOW :mystack[2 1]
SHOW POP "mystack2
SHOW POP "mystack1