Pop two values, compare them for inequality and put the Boolean result back on the stack.
Other comparison operators:
- Less Than or Equal (n2 <= n1)
Swap + Less Than + Logical Not
- Greater Than or Equal (n2 >= n1)
Less Than + Logical Not
Swap + Less Than
Note that this operator should only be used in version 4. Since version 5, it is better to use Less Than (typed) or Greater Than (typed).